What do scientists think caused the mass extinction at the end of the Permian Period?

What gas is released during photosynthesis?

The mass extinction of the large mammals during the Cenozoic Era was probably due to

What happens to pressure, temperature, and density as you go deeper into Earth's layers?

The theory that explains why and how continents move is called

The Himalaya Mountains were formed in a collision at a

The geologic time scale is subdivided into

The Pacific - Ring of Fire is

Which of the following can effect how a building responds to seismic waves?

Which of the following is least likely to cause deaths during an earthquake?

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