Science review

Alyssa is roasting a marshmallow over a campfire. What process is taking place?

• Solar energy is transferring from fire to marshmallow.

• Heat energy is transferring from fire to marshmallow.

• Light energy is transferring from fire to marshmallow.

• Wind energy is transferring from fire to marshmallow.

Water is being boiled on a stove and changed to a gas. What is the source of thermal energy causing this change?

• The water vapor rising from the pot

• The heat from the stove

• The water in the pot

• The pot

What is true about the Sun, light bulbs, and flames?

• They are all made by people.

• They are all found in nature.

• They are all sources of light energy.

• They are all made of fire.

Which of these is a TRUE statement?

• Sound sometimes travels easier through gases than solids.

• Sound travels through solids, liquids, and gases at the same speed.

• Sound travels through solids easier than liquids.

• Sound travels through gases easier than liquids.

A solar cell is used to run a small fan. Describe the energy transformation in a solar cell.

• It transforms light energy into electrical energy.

• It transforms electrical energy into light energy.

• It transforms heat into mechanical energy.

• It transforms heat into light energy.

Jack put a bucket of sand outside with a thermometer in it. He measured the temperature of the sand twice each day. He wrote down his measurements in this table.

What caused the temperature of the sand to change?

• The sun warmed the sand during the day.

• Wind warmed the sand during the day.

• The moon cooled the sand each night.

• Clouds cooled the sand each night.

Sound travels in waves. Sound waves cannot travel through

• air.

• water.

• space.

• solids.

Which form of energy is made up of waves?

• Nuclear

• Light

• Electrical

• Chemical

Timmy puts a toy boat into the river and the toy boat is carried downstream by the ___________.

• friction

• gravity

• water current

• wind

On a blustery day, Elizabeth flies a kite. The _________ powers the kite and allows it to travel both up and away from Elizabeth.

• wind

• water

• sun

• rain