# Tracy Perkins

## Geology

## South Mountain Community College

## Website Content Contributions

### Activities (11)

Snow Melt and Stream Flow in the Animas River (Advanced) part of Keyah Math:Activities

This activity consists of a set of problems in which students explore the contributions of water from rainfall and snowmelt over the watershed of the Animas River in southwestern Colorado. Students first compute ...

Measuring the Size of the Earth part of Keyah Math:Activities

In this activity, students explore the method used by Eratosthenes to estimate the circumference of the earth. After engaging with the geometry and data Eratosthenes used, students compute the radius and volume of ...

Measuring the Size of the Earth from Arizona part of Keyah Math:Activities

In this activity, students use the geometric method of Eratosthenes and geographic data from Arizona to estimate the circumference of the earth. The circumference is then used to compute the radius and volume of ...

The Epicenter of a Southwestern Earthquake part of Keyah Math:Activities

This activity guides students to use the measured difference in P and S wave velocities to locate the epicenter of a minor earthquake in the Southwestern United States. Click here to view the full activity on the ...

Impact Processes at Meteor Crater part of Keyah Math:Activities

In this activity, students are introduced to impact processes in a study of Meteor Crater in northern Arizona. They are guided in the use of a set of relatively simple formulas from physics to estimate the energy ...

Ages of Rocks and the Earth part of Keyah Math:Activities

This activity introduces students to the mathematics of radiometric dating. Students first apply the rubidium-strontium isotopic system to date rock samples from the San Juan Mountains of southwest Colorado, and ...

Mass and Density of the Earth part of Keyah Math:Activities

This activity is intended as a follow-up to the Measuring the Size of the Earth and Measuring the Size of the Earth from Arizona activities. Students use data on the radius and volume of Earth, Newton's Law of ...

Layers of the Earth part of Keyah Math:Activities

Students use graphs of seismic wave travel times, and value for the diameter of Earth obtained in the Size of the Earth activity, to investigate the internal structure of the Earth and determine that it is layered. ...

Geochronology in the San Juan Mountains (Advanced) part of Keyah Math:Activities

This is a mathematically more advanced version of the Ages of Rocks and the Earth activity that introduces students to the mathematics of radiometric dating. Students derive the decay equation for the ...

Impact Processes at Meteor Crater (Advanced) part of Keyah Math:Activities

This is a more mathematically advanced version of the Impact Processes activity that introduces students to impact geology in a study of Meteor Crater in northern Arizona. Students use a set of formulas from ...

Stream Flow in the Animas River part of Keyah Math:Activities

This activity consists of a set of problems in which students explore a simplified method for predicting streamflow in the Animas River in southwestern Colorado. Students first compute the area of the watershed ...