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Chapter 17&18 Vocab

Across
Oil that is pumped from the ground
is the gathering of solar energy by collectors that are used to heat water or heat a building.
describes energy that does not come from fossil fuels and that is still in development.
Lightweight atomic nuclei combine to form a heavier nucleus and release tremendous amounts of energy.
is electrical energy produced by falling water.
Oil deposits that can be extracted profitably at current prices using current technology
Collisions of neutrons that cause the nuclei to split
is energy from sources that are constantly being formed.
is the percentage of energy put into a system that does useful work.
Down
is a device that produces electricity chemically by combining hydrogen fuel with oxygen from the air
is the use of sunlight to heat buildings directly.
Machine that converts mechanical energy or motion into electrical energy
is the process of saving energy by reducing energy use and waste.
is the energy produced by heat within Earth.