All of these are common environmental impacts of underground coal mining EXCEPT _____.

_____ refers to the maximum size to which a population can grow, given a resource base.

The current population of the earth is approximately _____ people.

Which of these is NOT a common earthquake hazard? _____

The deadliest natural disaster in U.S. history was _____.

_____ has so many sinkholes that it has an area known as “Sinkhole Alley.”

Which of these geologic resources are MOST important for sustaining life? _____

Mauna Loa in Hawaii is a _____ volcano, and it is the biggest volcano on earth. It is created by stacked  lava flows.

Which of these types of ice is located at the North Pole? _____

_____ has so many sinkholes that it has an area known as “Sinkhole Alley.”