Temperature Profiles in Permafrost part of Activity Collection
Students use STELLA to create a model of heatflow in permafrost to attempt to replicate the findings of Lachenbruch and Marshall (1986), who used inflections in the geothermal gradient of Alaskan permafrost to search for evidence of climatic change.

Radioactive Decay and Geochronology part of Activity Collection
Students create a STELLA model of the radioactive decay process.

Angle of Repose part of Activity Collection
A student activity to determine the angle of repose and what factors determine the angle of repose.

Applications of Vector Operators for Surface Atmospheric/Oceanic Processes part of Activity Collection
This lab exercise provides students with activities utilizing vector operations within the context of the atmospheric and oceanic environments.

Illustrating Hillslope Diffusion with Physical and Numerical Models part of Activity Collection
This problem illustrates how numerical theories are developed, how we might test this theory with an analog model, and how numerical models are constructed and the limitations of numerical modeling.

Air-sea Interactions: Activities in Oceanography part of Activity Collection
This online set of activities help students learn properties of ocean waves, wind-wave relationships and properties of tsunamis.

Mid-level spreadsheeting and complex modeling of real-world scarp evolution part of Activity Collection
This exercise is a second or familiarization exercise in spreadsheeting, but is also a mathematical model for slope evolution. It uses the concept of "erosivity" (generally, the relative ratio of driving and resisting forces) and slope angle to reshape an initial topography. Finally, it asks the students themselves to come up with a real-world situation worth modeling.

Exploring Radiometric Dating with Dice part of Activity Collection
An activity in which students use dice to explore radioactive decay and dating and make simple calculations.

Demonstration of radioactive decay using pennies part of Activity Collection
A demonstration (with full class participation) to illustrate radioactive decay by flipping coins. Shows students visually the concepts of exponential decay, half-life and randomness. Works best in large classes -- the more people, the better.

Determining Earthquake Probability and Recurrence from Past Seismic Events part of Activity Collection
A homework/classroom activity where students collect historical earthquake information and use it to forecast the probability of larger earthquakes.