Plate Tectonics

Scientists believe these to be the driving force behind plate tectonics.

• seismic waves

• convection currents

• changes in temperature

• seafloor spreading

Tectonic plates float on this "jello-like" layer of the mantle.

• upper mantle
• asthenosphere
• lithosphere
• lower mantle

What are the two innermost layers of Earth's interior?

• inner and outer core

• upper and lower core

• middle and upper core

• top and bottom core

What is the core made of?

• iron and nickel

• iron and silver

• iron ore and gold

• iron and aluminum

What are earthquake waves called?

• seismic waves
• sonic waves
• sound waves
• heat waves

Which type of Earth's crust is the thickest?

• Continental

• Oceanic

The crust and upper mantle make up the ____.

• Lithosphere

• Asthenosphere

• Upper Mantle

• Lower Mantle

How many layers does the mantle have?

• one

• two

• three

• four

This type of wave arrives first at a seismograph station?

• Surface

• Primary

• Secondary

• Seismic

Waves that move rock particles back and forth in the same direction that the wave travels… think slinkies!

• surface waves
• primary waves
• secondary waves
• heat waves