At a _____________ plate boundary, no old crust is consumed and no new crust is formed.

What is the cause of foliation in metamorphic rocks?

Our best estimate for the age of the Earth is:

Which metamorphic agent does NOT increase the rate of chemical reactions?

What is the study of the origin and evolution of Earth, the continents, oceans, atmosphere and biota?

The ocean crust has magnetic anomalies that are both parallel to and symmetric around ocean ridges.

Areas where magma rises to the surface, such as Hawaii, are known as:

Which type of crust is older and thicker?

Which molten material is found beneath Earth’s surface?

Earth’s current magnetic field is reversed.