SCIENCE

• A convection current is caused by differences in temperature resulting to variation in
• It is a measure of how much mass there is in a volume of a substance.

• Scientists believe that the motion of tectonic plates is caused by

• Hot molten materials in a convection cell rises near the
• A layer beneath where the less dense hot molten material rises, and sinks

The idea that Earth's lithosphere is broken up into separate plates that float on the mantle is the theory of

The region in which one plate moves under another is

The motion of gas or liquid caused by differences in temperature is a

A driving force for plate motion at mid-ocean ridges as a result of the rigid lithosphere sliding down

The process of one plate moving under another plate

-Tectonic plates ride on

• The plastic-like upper portion of the mantle
• A soft, weak and plastic-like layer, the upper part of the mantle where lithospheric plates float and move

The region where old crust melted back into magma is

NOT a method of heat transfer

NOT a driving force of tectonic plates

What is the source of heat in a mantle convection current