You’re concerned about water availability in the next 50 years.  Would you be better off living in a suburb dependent on groundwater or an urban area that also accesses river water for municipal use?

About how many major watersheds (e.g., Mississippi River to Gulf of Mexico) exist in Minnesota?

Which of the following is NOT thought to be a possible source of Earth’s hydrosphere water?

What source of electricity has grown fastest in terms of overall production in the last 20 years?

Groundwater contributes to streamflow?

Enter the residence time of water in the oceans.  Express your answer in years and enter only a number.  

Aerobic bacteria appear in the geologic record more than 1 billion years ago?

You’re buying a house in a hilly neighborhood with strong seasonal rains and few trees (they were all removed prior to new construction).  Should you worry about mass wasting?

Which aquifer would be more susceptible to contamination

Which appears later in the fossil record?