What major climatic episode ended about 635 Ma, just prior to the sudden changes seen in the Cambrian?

Domestic water consumption per person per day in developed countries is about how many times greater than in developing countries?

What is meant by the half life of a radioactive isotope?

Minnesota has had earthquakes in the last century.  Roughly how many?

An aquifer is considered “confined” if:

Which of the following is the more likely trigger of a mass wasting event in Minnesota?

During the period between large earthquakes along a locked fault segment, how does the material near the fault respond to continuous tectonic plate motion away from the fault?

Mass wasting contributes little to landscape evolution?

If faults had no friction whatsoever, large earthquakes would still happen?

The global groundwater depletion rate (use minus replacement) is estimated at approximately: