Initial Publication Date: May 1, 2006
Earth System Science Vocabularies Part III:
Earth System Environments
Earth Structure
- inner core
- The center part of the earth's core, extending from a depth of about 5100 km to the center (6371 km) of the earth; is probably solid
- outer core
- The outer or upper zone of the earth's core, extending from a depth of 2900 km to 5100 km; it is presumed to be liquid
- mantle
- The zone of the earth below the crust and above the core; hypothesized to be largely of peridotitic composition
- oceanic crust
- The type of the earth's crust which underlies the ocean basins; is about 5-10 km thick; largely basaltic in composition
- continental crust
- The type of the Earth's crust which underlies the continents and the continental shelves; ranges in thickness from about 25-70 km; largely of granitic composition senso lato
- lithosphere
- The solid portion of the Earth, in plate tectonics, a layer of strength relative to the underlying asthenosphere for deformation at geologic rates; includes the crust and part of the upper mantle and is on the order of 100 km in thickness
- asthenosphere
- The layer or shell of the earth below the lithosphere which is weak and in which isostatic adjustments take place, magmas may be generated and seismic waves are strongly attenuated; part of the upper mantle
- troposphere
- Extends to altitudes of 10-16 km extending from the earth's surface in which temperature generally decreases rapidly with altitude, clouds form, and convection is active
- stratosphere
- The layer of the atmosphere extending from 10 to 50 km, overlying the troposphere; contains the protective ozone layer which protects the biosphere from harmful ultraviolet radiation; characterized by a region of constant temperature for the first several km; between 20 and 50 km the temperature increases with height reaching a temperature maximum at the stratopause
- mesosphere
- The region in which temperature again decreases with increasing altitude, reaching a minimum at about 85 km.
- thermosphere
- Extends out to about 500 km; is a region of increasing temperature
Atmospheric Structure
Physiographic Provinces
Oceans
- continental shelf
- That part of the continental margin that is between the shoreline and the continental slope; characterized by its very gentle slope of .1o
- continental rise
- That part of a continental margin that is between the continental slope and the abyssal plain, common to trailing edges and uncommon on leading edges. It is a gentle incline with slopes of 1:40 to 1:2000, and generally smooth topography although it may bear submarine canyons
- continental slope
- That part of the continental margin that is between the continental shelf and the continental rise if there is one. It is characterized by its relatively steep slope of 3-6o
- abyssal plain
- A flat region of the ocean floor, usually at the base of a continental rise, whose slope is less than 1:1000. It is formed by deposition of gravity-current and pelagic sediments that obscure the preexisting topography
- mid ocean ridge
- A continuous, seismic, median mountain range extending through the North and South Atlantic Oceans, the Indian Ocean, and the South Pacific Ocean. It is a broad, fractured swell with a central rift valley and usually extremely rugged topography; it is 1-3 km in height and about 1500 km in width and over 84,0000 km in length
- oceanic islands
- Island either composed of basalt or of biogenic origin (e.g. coral reef, etc.) as distinguished from islands having rocks characteristic of continents
- atoll
- A coral reef appearing in plan view as a ring or horseshoe-shaped reef, rising from deep water of the open sea, they typically form around volcanic islands which have subsided
- coral reef
- A coral (+/-algal) organic reef; a mound or ridge of in-place coral colonies and accumulated skeletal fragments
- seamounts
- An elevation of the sea floor, 1000 meters or higher, either flat-topped (called a guyot) or peaked. Seamounts may be either discrete, arranged in a linear or random grouping, or connected at their base and aligned along a ridge or rise
- oceanic plateaus
- A broad, more or less flat-topped and ill-defined elevation of the sea floor, generally over 200 meters in height
- passive margin (trailing edge)
- A continental margin formed by rifting and continental rupture; characterized by broad continental shelves and located within plates rather than at the leading edge of a plate
- active margin (convergent plate boundary)
- Marking the boundary between two plates that are moving toward each other; the leading edge of a tectonic plate
- ocean basin
- The area of the sea floor between the base of the continental margin, usually the foot of the continental rise, and the mid-ocean ridge
- trench
- A narrow, elongate depression of the deep-sea floor associated with a subduction zone. Oriented parallel to a volcanic arc and commonly to the edge of the continent
- island arc
- An offshore volcanic arc; generally a curved linear belt of volcanoes above a subduction zone
Coasts
- trailing edge coast
- A coastal area that is not the site of subduction or plate collision but is located in the interior of a lithospheric plate; characterized by gentle slopes and low energywaves
- leading edge coast
- A coastal area that is the site of convergent or transform plate motion; associated with uplift, and a steep coastline cut by high energy waves
- estuary
- The seaward end of the widened funnel shaped tidal mouth of a river valley where fresh water comes into contact with seawater and where tidal effects are evident
- delta
- The low, nearly flat, triangular or fan-shaped alluvial tract of land at or near the mouth of a river, often crossed by many distributaries of the main river, perhaps extending beyond the general trend of the coast
- coastal plain
- A flat area of low elevation, smooth and level or gently undulating land underlain by sedimentary rock having few or no prominent surface irregularities parallel to a coast
- piedmont
- Lying or formed at the base of a mountain or mountain range; in the United States-a plateau underlain by crystalline rock extending from New Jersey to Alabama and lying east of the Appalachian Mountains
Mountains
Any part of the Earth's crust sufficiently elevated above the surrounding land surface of which it forms a part, typically with steep sides considerable bare rock surfaces and a restricted summit area- volcanic mountains
- Formed by deposition of volcanic rocks and not be deformation of preexisting rock; found on land and seafloor (e.g. Hawaiian Islands), island arcs (e.g. Aleutian Islands); continental arcs (e.g. Cascade Range)
- fold and thrust mountains (compressional)
- Resulting from compressional deformation, faulting and folding; crustal shortening occurs by slip on sub-parallel thrust or high-angle reverse faults
- fault-block mountains (extensional)
- Mountains formed by extensional processes that form horsts and grabens (e.g. Basin and Range) by normal faulting
- basin and range
- Topography, landscape or physiographic province characterized by a series of tilted fault blocks forming longitudinal, asymmetric ridges or mountains and broad, intervening basins
- basins
- A depressed area with no surface outlet; a low area in the earth's crust of tectonic origin in which sediments have accumulated
- rift valley
- A valley that has developed along a rift where stretching of the lithosphere has occurred; the deep central cleft in the crest of the mid-ocean ridge
Continental Interior
- interior (intracratonic) basin (e.g. Michigan, Wyoming basin)
- A depression entirely surrounded by higher land and from which no stream flows outward to the ocean
- shield or craton
- Part of the Earth's continental crust that has attained stability and has been little deformed for a prolonged period; mostly Precambrian in age
- greenstone belt
- Term applied to elongate or belt-like areas within Precambrian shields that are characterized by abundant greenstone; includes volcano-sedimentary piles, with a general trend from mafic to felsic volcanics
- high-grade terrane, or granite-gneiss belt
- Term applied to Precambrian (usually Archean) terranes that have experienced granulite or upper amphibolite facies metamorphism, extensive penetrative deformation, and usually accompanied by intrusion of syn- or post-kinematic granitoids
- plateau
- Any flat area of great extent and elevation, considerably elevated above the adjacent country or sea level; may be tectonic (e.g. isostatic uplift of the Colorado Plateau), residual or volcanic (e.g. Columbia Plateau) in origin
- plains
- Any flat area at low elevation
- steppes
- An extensive, treeless grassland area in the semiarid mid latitudes of southeastern Europe and Asia; typically located in interior portions of continents in the Northern Hemisphere
USGS Physical Divisions of the United States; Divisions, Provinces, (Sections)
- Appalachian Highlands
- Adirondack Province, Appalachian Plateaus Province (Allgeheny Mountains, Catskills, Cumberland Mountains, Kanawha, Mohawk, Southern New York), Blue Ridge Province (northern, southern), New England Province (Green Mountain, New England Upland, Seaboard Lowland, Taconic, White Mountain), Piedmont Province (Piedmont Lowlands, Piedmont Upland), St. Lawrence Valley Province (Champlain), Valley and Ridge Province (Hudson Valley, Middle, Tennessee)
- Atlantic Plain
- Coastal Plane Province (East Gulf Coastal, Embayed, Floridian, Mississippi Alluvial, Sea Island, West Gulf Coastal Plains)
- Interior Highlands
- Ouchita Province (Arkansas Valley, Ouachita Mountains) and Ozark Plateaus Province (Boston "Mountains", Springfield-Salem)
- Interior Plains
- Central Lowland Province (Dissected Till, Eastern Lake, Osage Plains, Till Plains, Western Lake, Wisconsin Driftless), Great Plains Province (Black Hills, Central Texas, Colorado Piedmont, Edwards Plateau, High Plains, Missouri Plateau, Pecos Valley, Plains Border, Raton), and Interior Low Plateaus Province (Highland Rim, Lexington Plain, Nashville Basin)
- Intermontane Plateaus
- Basin and Range Province (Great Basin, Mexican Highland, Sacramento, Salton Trough, Sonoran Desert), Colorado Plateaus Province (Canyon Lands, Datil, Grand Canyon, High Plateaus of Utah, Navajo, Uinta Basin), Columbia Plateaus Province (Blue Mountain, Harney, Payette, Snake River Plain, Walla Walla Plateau)
- Laurentian Upland
- Superior Upland Province
- Pacific Mountain System
- Cascade-Sierra Mountains Province (Middle Cascade, Northern Cascade, Sierra Nevada Mountains), Lower Californian Province, Pacific Border Province (California Coast, California Trough, Klamath Mountains, Los Angeles Ranges, Olympic Mountains, Oregon Coast Range, Puget Trough)
- Rocky Mountain System
- Middle Rocky Mountains Province, Northern Rocky Mountains Province, Southern Rocky Mountains, Wyoming Basin
- polar
- A climatic zone located in the polar latitudes, marked by conditions too harsh to support vegetation
- tundra
- Treeless plains that lie poleward of the tree line; the plants thereon are sedges, mosses, lichens and a few small shrubs; underlain by permafrost
- temperate
- The latitudinal zones that lie between 23.5 and 66.50 N or S respectively.
- tropical
- The zone of the Earth's surface between the Tropics of Cancer 23.5 N and Capricorn 23.5 S; any area of the earth with tropical conditions
- mid-latitude desert
- A vast desert area occurring within latitudes 30-50o north or south of the Equator in the interior of a large continental mass
- rain shadow deserts
- Found on the lee-side of mountain ranges (e.g. east of the Sierra Nevada Mountains)
- interior desert
- Found in continental interiors far from sources of moisture (e.g. Gobi and Takla Makan deserts of Central Asia)
- coastal desert
- Any desert bordering an ocean with an offshore cold current; also known as west-coast desert
- polar desert
- Areas of low precipitation in polar regions due to sinking of cold dry air
- savannah (seasonal)
- A tropical or sub-tropical region of grassland and other drought-resistant vegetation; having a long dry season but with a pronounced wet season and continuously high temperatures
- mediterranean
- Characterized by mild, wet winters and warm to hot, dry summers; typically occurs on the west side of continents between about 30 and 45o latitude
- humid
- A climate that is characterized by large annual temperature variations and sufficient moisture to support abundant plant life
- arid
- A locale with a climate characterized by insufficient moisture to support appreciable plant life
- biome
- A climax community that characterizes a particular natural region, especially a particular type of vegetation, climatically bounded, which dominates a large geographic area
Climatologic Provinces
Deserts
A region with a mean annual precipitation of 10 inches or less; typically devoid of vegetation- mid-latitude desert
- A vast desert area occurring within latitudes 30-50o north or south of the Equator in the interior of a large continental mass
- rain shadow deserts
- found on the lee-side of mountain ranges (e.g. east of the Sierra Nevada Mountains)
- interior desert
- found in continental interiors far from sources of moisture (e.g. Gobi and Takla Makan deserts of Central Asia)
- coastal desert
- Any desert bordering an ocean; also known as west-coast desert
- polar desert
- Areas of low precipitation in polar regions due to sinking of cold dry air
Forests
Biological communities that are dominated by trees and other woody vegetation- tropical rain forest
- Occur near the equator, bounded by latitudes 23.5o N and S; great diversity of species; temperature on average is 20-25oC, annual rainfall exceeding 2000 mm, soil is nutrient poor and acidic, typically with a multi-layered canopy
- temperate forests
- Well-defined seasons with distinct winter; growing season of 140-200 days, 4-6 months frost free; temperature varies from 30 to +30oC; 75-150 cm annual precipitation
- deciduous forests
- Plants that shed their leaves annually
- coniferous forest
- Gymnosperm plants, having needle-like or scale-like leaves and bearing cones that bear seeds
- boreal (taiga)
- Occurs between 50 and 60o north latitude; seasons are divided into short, moist and moderately warm summers and long, cold and dry winters; growing season is <130 days; temperatures are very low, precipitation is mostly in the form of snow 40-100 cm annually
Grasslands
Lands dominated by grasses rather than large shrubs or trees- savannah (tropical grasslands)
- Grassland with scattered individual trees; warm or hot climate with a distinct wet and dry season; where annual rainfall is from 50-127 cm/year and is concentrated in 6-8 months followed by a long period of drought when fires can occur
- temperate grasslands (also pampas of Argentina; steppes of Russia; plans and prairies of central North America)
- Distinct seasons that vary from hot summer to cold winter (-40 to +38oC), and moderate rainfall (50-90 cm/year)
Tundra
Extremely cold climate, low biotic diversity, simple vegetation structure, limited drainage, continuous to discontinuous permafrost, short growing season- arctic
- In northern hemisphere encircling the north pole, cold desert-like conditions; growing season ranges from 50-60 days; winter temperature is 34oC with summers as high as 3-12oC; precipitation is 15-25 cm/year; soil is permafrost
- alpine/sub-alpine
- Located on mountains throughout the world at high altitude where trees can't grow
Aquatic Freshwater
Containing low salt concentration, usually less than 1%- lakes and ponds
- Bodies of freshwater ranging from a few square meters to thousands of square kilometers
- streams and rivers
- Bodies of flowing water, confined to a channel(s) moving in one direction
- wetlands
- Areas of standing water that support aquatic plants; marshes, swamps, and bogs
Aquatic Marine
Covers about 75% of Earth's surface; large bodies of saline waters- intertidal (littoral) zone
- Where the ocean meets the land; sometimes it is submerged and at other times exposed as waves and tides come in and out; may be vertically stratified on rocky coasts, less stratified on sandy shores; between high and low water
- pelagic zone
- Waters farther from land, open ocean; marine organisms whose environment is the open ocean, rather than the bottom or shore areas
- benthic zone
- Below the pelagic zone, pertaining to the substrate or organisms living on or in the substrate
- abyssal zone
- Deep ocean, very cold water; pertaining to the ocean environment or depth zone of between 3500 and 6000 meters; including the organisms of that environment
- oceanic vent communities
- Ecosystems that have developed at hydrothermal vent areas (e.g. along segments of the mid-ocean ridge); these systems are typically dependent on chemosynthesis for energy to sustain the system; home to thermophilic bacteria and tube worms
Culture
Environments (or State) of Human Habitation
- Neolithic
- Relating to the latest period of the Stone Age characterized by polished stone implements
- Paleolithic
- Relating to the earliest period of the Stone Age when chipped stone tools were first used
- agrarian
- A way of life that is deeply embedded in the demands of agricultural production
- nomadic or pastoral
- Subsistence activity that involves the breeding and herding of animals to satisfy the human needs of food, shelter, and clothing
- hearth areas
- Geographic settings where new cultural practices such as agriculture, language, and religion have developed, and from which they have subsequently spread (e.g. the Fertile Crescent)
- urban
- Relating to life in a city
- suburban
- An outlying part of a city or town, surrounding the urban core
- metropolitan
- A central city and adjacent counties or cities with functional connections to the central city
- rural
- Characteristic of the country, suggests open land and farming
- More Developed Country (MDC; or Developed Country)
- A country that has demonstrated progress in development as measured by economic, social (education, health) and demographic indicators of development, e.g. Human Development Index (created by the United Nations)
- Less Developed Country (LDC; or Developing Country)
- A country in early stages of progress towards development as measured by economic, social (education, health) and demographic indicators of development, e.g. Human Development Index (created by the United Nations)
Scale of Human Habitation
- community or neighborhood
- People living near one another; a section lived in by neighbors and usually having distinguishing characteristics; people with common interests living in a particular area
- urban system
- An interdependent set of urban settlements (towns and cities) within a specified region
- county (or parish)
- The largest territorial division for local government within a state of the United States
- state or province
- One of the constituent units of a nation having a federal government
- region (of country)
- A collective identity based on a population's politico-territorial identification within a state or across state boundaries
- nation or country
- A group of people often sharing common elements of culture such as religion, language, or a history of political identity; and possessing a more or less organized government and territory, characterized by a relatively large size and independent status
- supranational organization
- A collection of individual states with a common goal that may be economic and/or political in nature (e.g. the European Union, OPEC)