What are the instruments that record vibrations in the ground called?

The idea that an earthquake will occur where it hasn't for awhile is known as what?

What effect does wind and water have on mountains?

If a volcano has a lot of silica there will be more trapped gasses. Which word will describe this type of volcano?

Crater Lake in Oregon is a great example of which of these?

What is known as an area of deep cracks at a divergent boundary?

What do we call comparing the age of objects or events to one another?

If sediment is not depositied for a while, it is called which of these?

Which of these processes establishes an object's age in years?

What is another term for an unstable isotope?

Which best describes an organism being preserved in amber?

If Earth's history were one year long, when did humans arrive?

Which of the following is an example of a renewable resource?

What is the first step in coal formation?

Reducing waste and reusing natural resources is called what?

Electricity produced by moving water is called what?

What percentage of Earth is covered with water?

About how much of Earth's fresh water is frozen and not available for use?

What do we call a lake created behind a dam to store water?

Which layer of the ocean is warmest and least dense?

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