Earth's Layers and Plate Tectonics

1. Which layer of the Earth is the hottest?

• Crust
• Mantle
• Outer Core
• Inner Core

2. Where does thermal convection primarily occur?

• In the atmosphere
• In the oceans
• In the Earth's mantle
• In the crust

3. What is the equation for density?

• D = M + V
• D = M - V
• D = M / V
• D = V / M

4. If oil floats on water, what does this indicate about the density of oil compared to water?

• Oil is denser than water
• Oil is less dense than water
• Oil has the same density as water
• Oil's density is variable

5. Which 2 processes do scientists use to learn about the Earth's layers?

• Studying fossils
• Seismic wave analysis
• Magnetic field studies
• Weather patterns

6. What do seismic waves measure?

• Temperature changes
• Earth's magnetic field
• Earthquake activity
• Earth's layers

7. Which seismic wave can ONLY travel through solid rock?

• P Wave
• S Wave
• Surface Wave
• Rayleigh Wave

8. If an object sinks in water, what does that tell you about its density?

• It is less dense than water
• It is more dense than water
• It has the same density as water
• It is variable

9. Can scientists make direct observations within the Earth’s layers? Why?

• Yes, using drilling
• No, it's impossible to observe
• Yes, using seismic waves
• No, only through indirect methods

10. What can result from convection currents in the Earth's interior?

• Trenches
• Ridge Crests/Volcanoes
• All of the above
• None of the Above