Front

What happens to water when it freezes?

Back

Water expands when it freezes.

Front

What is convection?

Back

Convection is the movement of gas or liquid in which warmer parts move up and the colder parts move down.

Front

How is heat transferred from a campfire to people sitting around it?

Back

Heat is transferred by radiation.

Front

What is the primary source of energy for most of the energy used by people?

Back

The primary source of energy is radiation from the sun.

Front

What do firemen wear to protect themselves from heat when entering burning buildings?

Back

Firemen wear heat resistant suits.

Front

Define thermal energy transfer.

Back

Thermal energy transfer is the process of heat moving from one object or substance to another.

Front

What are the three main methods of heat transfer?

Back

The three main methods of heat transfer are conduction, convection, and radiation.

Front

Explain conduction in the context of thermal energy transfer.

Back

Conduction is the transfer of heat through direct contact between materials.

Front

What role does the sun play in thermal energy transfer on Earth?

Back

The sun is the original source of most of the energy that people use, providing heat and light through radiation.

Front

How does the expansion of water when frozen affect its density?

Back

When water freezes, it expands and becomes less dense, which is why ice floats on water.