What is heat energy?

Matter is made of very small, moving _____________.

• cooler

• particles

• solid

• evaporates

Thermal energy moves as heat from a _______________object to a ________________object.

• cooler, warmer

• warmer, cooler

• water, solid

• heat, particles

When energy is changed from one form to another, at least some ___________is given off.

• water

• heat

• ice

• air

At 0 degree C, water is a ____________ called ice. At 100 degree C, water _____________and becomes the invisible called water vapor.

• air, evaporates

• solid, evaporates

• water, evaporates

• water, solid

______________ is the main source of heat on Earth.

• The moon

• A start

• The Sun

• A planet

_______________ energy affects matter.

• Heat

• Solid

• Air

• Water