Unit 3, Ch. 9 Earth Science Review

What are ways that the earth's layers can be classified: (select all)

• Composition (chemicals/minerals)

• Mechanical properties

• Color

• Shape

How do scientists learn about Earth's interior?

• By analyzing seismic waves from earthquakes

• By using satellites to scan the Earth's interior

• By drilling deep into the Earth's crust

• By studying rocks found on the surface

Which type of seismic wave arrives first at a seismometer?

• Secondary waves (S-waves)

• Tertiary waves

• Surface waves

• Primary waves (P-waves)

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

• Up and down

• Side to side

• Compression/expansion

• Circular

Which layer of the Earth is behaves plastically and can flow?

• Asthenosphere

• Lithosphere

• Outer core

• Crust

Which type of wave can only propagate through solids?

• Primary waves (P-waves)

• Secondary waves (S-waves)

• Surface waves

• Tertiary waves

What is the composition of the Earth's core?

• Magma and sediment

• Basalt and gabbro

• Silicate minerals

• Iron and nickel

What is the average composition of the continental crust?

• Peridotite

• Gabbro

• Granite

• Basalt

What is the lithosphere composed of?

• Crust and upper mantle

• Core and mantle

• Mantle and asthenosphere

• Crust and core

What is the thickness of the lithosphere?

• 100 meters

• 1 kilometer

• 10 kilometers

• 100 kilometers