___ is the common carbonate mineral in sea shells and coral reefs, and may be at risk of dissolving due to ocean acidification. This is also the main mineral in limestone caves.

Many of the largest deserts in the world, like the Sahara Desert, are found at the _____.

A state-of-the-art secure Class I landfill is lined with an impermeable barrier and has drain pipes to collect the _____ or “garbage juice.”

Most of earth’s fresh water is located in _____.

The land east (landward) of the Cascade Mountain Range in eastern Washington receives little rainfall and is a _____ desert.

Which of these is NOT a fossil fuel? _____

The Dust Bowl in the central U.S. states was caused by _____.

The land east (landward) of the Cascade Mountain Range in eastern Washington receives little rainfall and is a _____ desert.

The 2010 eruption of Eyjafjallajökull volcano in Iceland grounded airplane traffic in Europe for 6 days due to _____.

Which of these is NOT a fossil fuel? _____