What kind of currents cause heat transfer in the Earth?

• convection currents
• radiation currents
• conduction currents
• ocean currents

The diagram represents the movement of the mantle under the earth's crust. Which process is represented by the diagram?

• rotation
• conduction
• radiation
• convection

Which of the following changes would end Earth's tectonic activity?

• Earth's crust becomes a cooler solid
• Earth's mantles becomes a warmer semiliquid
• Earth's mantle becomes cooler and solid.
• Earth's outer core becomes warmer

What is the heat source for convection in the mantle?

• the Crust
• the Mantle
• the Core

What is the cooling source for convection in the mantle?

• the Crust
• the Mantle
• the Core

Hot matter is _________ dense and ___________

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

The part of the Earth that is a solid ball of iron and nickel

• inner core
• outer core
• mantle
• crust

What is the correct order (starting from the surface) of Earth’s layers? 

• crust, outer core, inner core, mantle 
• mantle, outer core, inner core, crust 
• crust, mantle, outer core, inner core 
• outer core, inner core, crust, mantle 

What is the thickest layer of the Earth?

• the crust
• the mantle
• the outer core
• the inner core

What is the core made of?

• steel
• iron 
• aluminum
• iron and nickel