Convection Currents review

Front

What happens to hotter material in the Earth's mantle?

Back

It becomes less dense and rises.

Front

What do molecules that are more dense than the surrounding particles do?

Back

They sink down.

Front

What happens to molten material when it is cooled in the mantle?

Back

The molecules condense (shrink together).

Front

What causes convection currents?

Back

Differences in temperature and density.

Front

Why do the plates of the crust move?

Back

Because of convection currents in the mantle.

Front

What is density?

Back

Density is the mass of a substance divided by its volume.

Front

How does temperature affect the density of materials?

Back

As temperature increases, materials generally become less dense.

Front

What is a convection current?

Back

A convection current is a movement of fluid caused by differences in temperature and density.

Front

What role do convection currents play in the Earth's mantle?

Back

They help to move tectonic plates.

Front

What happens to cooler material in the mantle?

Back

It becomes more dense and sinks.