Gr. 4 End of Mystery 8 Review

Coal was used to heat homes because it

• it didn't need to be burned like wood.

• was easier to get.

• had a lot more energy than wood.

What is a possible disadvantage of water energy with a dam?

• it is very bad for the environment

• it could harm marine (fish) life

• if it doesn't rain everyday, then you won't have power

Compared to wood, coal has

• five times for energy than wood.

• ten times for energy than wood.

• one hundred times for energy than wood.

What is a possible disadvantage of sun energy?

• It is bad for the environment.

• If it is cloudy, you are not getting energy.

• Animals are harmed by solar panels.

Coal, gasoline, and natural gas all

• are safe for the envirnment

• have less energy than wood

• have to be burned in order to release energy

Why are some forms of energy called "burnables?"

• They will burn your eyes if you get too close.

• They burn your skin if you touch them.

• They must be burned to get energy.

What is smog?

• a mixture of smoke and natural gas

• a combination of smoke and fog

• a combination of natural gas and fog

What is a possible disadvantage of using wind energy?

• It is bad for the envirnment.

• You need a lot of room for the windmills.

• It can pollute the water.