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What is the name of the fast, deep part of a river, usually near the center?

Since the whole Earth is made of minerals we have plenty of mineral resources to last forever…

Most coal was formed in the

Which of the following statements about the walls of The Grand Canyon is true?

_____ is the force per area while _____ the the deformation caused by ______

What is the source of the energy we obtain when we burn fossil fuels? (think about the whole process)

Oil is made from

Which of the following is a common hazard to a city when an earthquake occurs?

Describe why earthquakes happen when the plates only move a few centimeters each year.

What is the type of soil that is quite fertile, but has a high content of expanding clays?