Earth's Layers and Seismic Waves Quiz

What is the Earth's outermost layer called?

• Mantle

• Core

• Crust

• Lithosphere

How deep is the deepest hole humans have ever dug?

• Over 10 kilometers

• About 1 kilometer

• Over 100 kilometers

• About 12 kilometers

What is the primary method scientists use to learn about the Earth's interior?

• Direct observation

• Analyzing earthquake waves

• Drilling deep holes

• Using powerful magnets

Earthquake waves are also known as:

• Sound waves

• Seismic waves

• Light waves

• Water waves

Which type of seismic wave travels fastest?

• Surface waves

• S-waves

• P-waves

• All travel at the same speed

S-waves cannot travel through which layer of the Earth?

• Crust

• Mantle

• Outer core

• Inner core

What is the approximate temperature at the Earth's inner core?

• 1000°C

• 5000°C

• 5000°F

• 5500°C

What is the state of matter of the Earth's inner core?

• Liquid

• Gas

• Solid

• Plasma

What is the Earth's mantle primarily composed of?

• Iron and Nickel

• Molten rock (magma)

• Water and ice

• Solid rock

What evidence suggests that the Earth's core is mostly iron?

• The color of volcanic rock

• The Earth's magnetic field

• The density of the Earth

• Both b and c