Earth's Mechanism

A convection current is caused by differences in temperature resulting to variation in ___________.

• Air Pressure

• Color

• Density

• Mass

Scientists believe that the motion of tectonic plates is caused by ______________.

• Pressure in earth's Crust

• Conveyor belts

• convection current

• heat in the Earth's core

It is a measure of how much mass there is in a volume of a substance.

• Volume

• Temperature

• Density

• Mass

Hot molten materials in a convection cell rises near the ______________.

• Outer core

• Crust

• Inner core

• Mantle

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

• Continental Drift

• Seafloor spreading

• tectonic movement

• plate tectonics

The region in which one plate moves under another is ____________.

• Rift Valley

• Subduction zone

• magma chamber

• vent

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

• Tectonic movement

• plate tectonic

• convection current

• magma chamber

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

• Slab pull

• ridge push

• convection current

• seafloor spreading

The process of one plate moving under another plate is called ______________.

• Drifiting

• Plate tectonics

• seafloor spreading

• subduction

Tectonic plates ride on ________________.

• Inner core

• asthenosphere

• outer core

• lithosphere