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Sources of Energy

6th Grade Science Sources of Energy

Energy resources that can be recycled or replaced by natural processes in less than about 100 years are considered _____. renewable
Energy from the sun is (renewable/non-renewable) and it doesn't cause _____. pollution
Enough energy from the _____ reaches Earth in an _____ to supply all the energy in the world uses and one year. sun hour
Energy from the sun is called _____. solar energy
Solar calculators are powered by solar cells, which collect light and change it into _____. electricity
Nonpolluting, _____ and abundant solar energy sounds wonderful. renewable
Solar energy has some serious drawbacks. Solar cells can't work at _____. night
Different parts of the Earth receive _____ amounts of solar energy. different
Some scientists think that the best solution to energy problems might be to use _____ _____ and _____ in combination with other energy resources. fossil fuels ?
Today, windmills are used to generate _____ worldwide. electricity
In the U.S., regions of the Northeast, the _____, the Great Plains, and the _____ have been identified as having wind conditions best suited to using wind power. Midwest West
Wind is _____. It does not harm the _____ or produce waste. non-polluting environment
Only a few regions of the world have _____ strong enough to generate electricity. winds
The production of electricity using water is called _____ _____. hydroelectric power
The river water that backs up behind a dam creates a _____ or large reserve of water. reservoir
Hydroelectric power doesn't cause pollution and it is _____. renewable
Hydroelectric power as an energy source has its problems. When dams are built, the reservoir located behind the dam can fill with _____. sediiment
Land above the dam flooded and wildlife _____ are disturbed. habitats
Power plants have already been _____ near most rivers. built
The heat from magma and hot rock that surrounds it is called _____ _____. geothermal energy.
People in Iceland and California use the _____ _____ and steam from geysers to heat their homes. hot water
Geothermal energy has disadvantages. It can release hot, salty water at Earth's surface, which can be harmful to nearby _____ and _____. plants animals
Only a few places have _____ near the Earth's surface. magma
Nuclear energy is produced by splitting the _____ of certain elements. nuclei
The most commonly used fuel in nuclear power plants is _____. uranium
Nuclear energy also produces highly _____ nuclear waste. radioactive
This waste contains materials that can cause _____ or have other harmful effects on living things. cancer
Because of potential problems in storing nuclear waste, nuclear energy has seen limited use in the _____ _____. United States
_____% of the world's energy is supplied by fossil fuels. 90
Created by: blakelyk