Unit 3, Ch. 9 Earth Science Review

Front

How do scientists learn about Earth's interior?

Back

By analyzing seismic waves from earthquakes

Front

Which type of seismic wave arrives first at a seismometer?

Back

Primary waves (P-waves)

Front

What type of motion do primary waves (P-waves) have?

Back

Compression/expansion

Front

Which layer of the Earth behaves like a "plastic-like" solid that can flow?

Back

Asthenosphere

Front

Which type of wave can only propagate through solids?

Back

Secondary waves (S-waves)

Front

What is the chemical composition of the Earth's core?

Back

Iron and nickel

Front

What is the average composition of the continental crust?

Back

Granite

Front

What is the lithosphere composed of?

Back

Crust and upper mantle

Front

What is the thickness of the lithosphere?

Back

100 kilometers

Front

What is the mantle made of?

Back

Hot, but solid rock