Chapter 1

Question 1

Explain convection.

Answer 1

• usually the main form of heat transfer in liquids and gases.
• occurs in the Earth’s mantle causes tectonic plates to move.
• current is caused by the expansion (becoming bigger) of a liquid or gas due to its rise in temperature. The material becomes less heavy than the material around it and rises. As it gets colder, it starts to get heavier, which causes it to fall or sink. This starts the cycle (process) of a convection current. This only happens to fluids that are near an energy source that causes it to become bigger.