Plate Tectonics

Which of these layers is ALL solid iron and nickle?

• inner core
• outer core
• lithosphere
• mesosphere

Which of the following occurs because of convection currents?

• Tectonic plates on the crust move.
• The mantle increases in size.
• Pressure in the crust increases.
• Pressure in the crust decreases.

Scientists think that convection currents that move the plates flow in Earth's

• Continental crust
• Oceanic crust
• Asthenosphere
• Lithosphere

The mantle of Earth is made partly of magma. When magma rises and sinks, this is called ______________. 

• a conduction current
• a hot spot
• a volcanic eruption
• a convection current

As you travel from the inner core to the crust, how would temperature, pressure and density of the material change?

• They would all increase
• They would all decrease.
• They would stay the same.  
• Temperature would decrease, but pressure and density would increase. 

What would happen to the convection currents if the heat from the inner core disappeared? 

• They would stop. 
• They would change directions. 
• It would not change. 
• They would speed up. 

Where does the heat come from that drives this convection current in the mantle? 

• The sun
• The crust
• the mantle
• the core

Which is true about hotter material in the mantle?

• more dense, sinks
• less dense, sinks
• less dense, rises
• more dense, rises

This layer of Earth is the thickest part

• crust
• outer core
• mantle
• inner core

Which layer of the Earth is liquid iron?

• Crust
• Mantle
• Outer Core
• Inner Core