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BotEC: The Magnitude of the India-Asia Collision part of Quantitative Skills:Activity Collection
Peter Kresan
Question: The story of the Himalayas can be traced back to the breakup of the supercontinent, called Pangaea, about 200 million years ago, when India began its rapid movement northward towards Asia. Asia was a much ...

BotEC: The Scale of Earth's Atmosphere part of Quantitative Skills:Activity Collection
Peter Kresan
Question: Air is our most precious resource. Without food, we can live for weeks and without water, we can live for days. But without air to breathe, we survive about 4 minutes! If you visit the top of Mt. Lemmon ...

BotEC: The Magnitude of Geologic Time part of Quantitative Skills:Activity Collection
Peter Kresan
Question The oldest rock yet to be found on the earth is from Canada and is radiometrically dated at 3.8 billion years old. Various lines of evidence suggest that the earth is about 4.5 to 5 billion years old. A ...

BotEC: Walking to the Center of the Earth part of Quantitative Skills:Activity Collection
Peter Kresan
Question: The earth's interior is composed of three main concentric zones: the crust, the mantle, and the core. The outermost layer, the crust, averages 40 km thick on the continents and is thinner (averaging ...

BotEC: The Grand Canyon's Rate of Erosion part of Quantitative Skills:Activity Collection
Peter Kresan
Question: Some geologic processes, like volcanism and earthquakes, occur intermittently but can cause significant and sometimes catastrophic change very quickly. Others, like weathering, act continuously but ...

Back-of-the-Envelope Calculations: Earth History Timeline part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question The Earth is about 4.6 billion years old. Let's try to get a perspective on how long that really is. A roll of good quality toilet paper has 1000 squares. If the roll of toilet paper represents the ...

Back-of-the-Envelope Calculations: Energy Released in an Earthquake part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question A magnitude 8.5 earthquake (such as the 1964 Good Friday earthquake in Alaska) releases about 1x1018 joules of energy. The atomic bomb exploded over Hiroshima released about 1.5x1013 joules of energy. How ...

Back-of-the-Envelope Calculations: Age of the Earth part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question The Earth is about 4.6 billion years old. Let's try to get a perspective on how long that really is. Suppose that you decided to count to 4.6 billion and that you counted 1 number every second. How ...

Back-of-the-Envelope Calculations: Approaching Asteroid part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question If asteroids careen through the solar system at 25 km/second, how far away would we have to detect one in order to have a year's notice to prepare for an impact, as was portrayed in the movie Deep ...

Back-of-the-Envelope Calculations: Rate of Lava Flow part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question In 1983, an eruption began at Kilauea Volcano in Hawaii that has proved to be the largest and longest-lived eruption since records began in 1823. Lava has poured out of the volcano at an average rate of ...



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