20.5: Earth's Energy- Challenge 1

1. An idle ball on a hilltop, though not moving, contains ___.

potential energy

2. When we kick a soccer ball, potential energy gets converted into ___.

kinetic energy

3. Energy ___ describes how much useful work is extracted from one unit of energy.

efficiency

4. ___ is the amount of useable energy available in a resource after accounting for the amount of energy needed to make that energy available.

Net energy

5. To be energy efficient at home, ___.

make sure your home is well-insulated, replace incandescent bulbs with compact fluorescent bulbs, and turn off the heating/AC when not at home

6. Energy conservation can be achieved through ___ energy use.

efficient

7. Wind and moving water are sources of ___ energy.

renewable

8. ___ energy, while renewable, is not totally environmentally friendly.

Biomass

9. Renewable energy sources self-replenish ___ than they can be used up.

more quickly