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Calculating a Simple Phase Diagram: Diamond=Graphite part of Cutting Edge:Petrology:Teaching Examples
Dexter Perkins, University of North Dakota-Main Campus
This is a very short exercise designed to get students to understand how the Gibbs energy equation is used to calculate the location of a reaction in P-T space. I use it in-class and have students work on it in ...

Introduction to Gibbs Energy part of Cutting Edge:Petrology:Teaching Examples
Dexter Perkins, University of North Dakota-Main Campus
This is a short project that can be used in-class or as homework. It involves just a few questions and it is intended to help students understand the idea of Gibbs free energy.

Two streams, two stories... How Humans Alter Floods and Streams part of Quantitative Skills:Activity Collection
Eric Baer, Highline Community College
An activity/lab where students determine the changes in 100-year flood determinations for 2 streams over time.

Vectors and slope stability part of Quantitative Skills:Activity Collection
Eric Baer, Highline Community College
An in-class activity or homework for graphically solving slope-stability problems with vectors.

How Fast Do Materials Weather? part of Starting Point-Teaching Entry Level Geoscience:Interactive Lectures:Examples
Rebecca Teed, Wright State University-Main Campus
A think-pair-share activity in which students calculate weathering rates from tombstone weathering data. -

Carbon Dioxide Exercise part of Starting Point-Teaching Entry Level Geoscience:Interactive Lectures:Examples
Rebecca Teed, Wright State University-Main Campus
Students work in groups, plotting carbon dioxide concentrations over time on overheads and estimating the rate of change over five years. -

The Modern Atmospheric CO2 Record part of Starting Point-Teaching Entry Level Geoscience:Teaching with Data:Examples
Bob Mackay, Clark College
Students compare carbon dioxide (CO2) data from Mauna Loa Observatory, Barrow (Alaska), and the South Pole over the past 40 years to help them better understand what controls atmospheric CO2. -

Back-of-the-Envelope Calculations: Weight of Gold part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question Let's suppose that you have a shoe box full of water (the box is waterproof, of course). The shoe box weighs about 9 kg (19.8 pounds). Suppose you emptied the box and filled it completely with rock ...

Estimating Exchange Rates of Water in Embayments using Simple Budget Equations. part of Quantitative Skills:Activity Collection
Keith Sverdrup, University of Wisconsin-Milwaukee
Simple budgets may be used to estimate the exchange of water in embayments that capitalize on the concept of steady state and conservation principals. This is especially true for bays that experience a significant exchange of freshwater. This exchange of freshwater may reduce the average salt concentration in the bay compared to seawater if it involves addition of freshwater from rivers, R, and/or precipitation, P. Alternatively, it may increase the average salt concentration in the bay compared to seawater if there is relatively little river input and high evaporation, E. Since freshwater input changes the salt concentration in the bay, and salt is a conservative material, it is possible to combine two steady state budgets for a bay, one for salt and one for water, to solve for the magnitude of the water flows that enter and exit the bay mouth. Students will make actual calculations for the inflow and outflow of water to Puget Sound, Washington and the Mediterranean Sea and compare them to actual measured values.

Is There a Trend in Hurricane Number or Intensity? part of Cutting Edge:Hurricanes-Climate Change Connection:Activities
Todd Ellis, SUNY College at Oneonta
This lab guides students through an examination of the hurricane record to determine if there is a trend in hurricane intensity over the past 40 years and introduces some issues related to statistics and ...