Sources of Energy Earth’s energy comes from two sources- 1. The Sun (Nearly all of Earth’s energy comes from the Sun.) 2.Radioactive atoms inside Earth’s interior Energy sources are renewable or nonrenewable.

Sources of Energy Renewable Nonrenewable Energy sources that are easily replaced or available on a perpetual basis, IF managed properly. Energy sources found in limited amounts. They are used up much faster than they can be replaced.

1. Fossil fuels 2. Nuclear

Fossil Fuels 1.Fossil fuels are coal, oil (petroleum), and natural gas. (solid, liquid, gas) 2.Solar energy is stored in fossil fuels as chemical energy. 3.Fossil fuels come from within the Earth and are concentrated sources of energy. 4.Fossil fuels are rich in hydrogen and carbon. 5.Gasoline is made from petroleum. 6.Burning fossil fuels creates air pollution, which may lead to global warming.

Fossil Fuels AdvantagesDisadvantages Coal, oil (petroleum), natural gas 1.Relatively inexpensive 2.Easy to use 3.Easy to store 4.Easy to transport 5.Concentrated 1.Air pollution 2.Nonrenewable 3.Global warming/ acid rain

Nuclear Energy 1.Nuclear energy is energy stored in atomic nuclei. 2.Uranium, an element found in rocks all over the world, is used in nuclear energy. Uranium atoms are easier to split. 3.Splitting the atom’s nucleus is fission. Combining nuclei is fusion (happens in the Sun). 4.It is a concentrated source of energy that produces very little air pollution, but is does produce radioactive waste.

Nuclear Energy AdvantagesDisadvantages Nuclear1.Little to no air pollution 2.Little waste 3.Very concentrated 1. Radioactive waste

Renewable Energy Sources- Source I AdvantagesDisadvantages Solar- energy from the Sun I 1. Never runs out 2.No pollution 3.Cheap to use 1. Expensive to build 2.Sun doesn’t always shine Wind- energy from moving air I1.Never runs out 2.No pollution 3.Cheap to use 1.Wind does not blow continually 2.Expensive to install 3.Noisy 4.Requires lots of land 5.Hazard to birds

Renewable continued- SourceAdvantagesDisadvantages Hydroelectric- energy from moving water 1. No pollution 2. Cheap 1. Expensive to build 2.Floods land 3.Harms wildlife habitats Tidal- energy from tides I1. Cheap 2.No pollution 1. Can only be used in a few places

Renewable continued- SourcesAdvantagesDisadvantages Geothermal- energy from inside Earth I 1. Reliable 2.Efficient 3.Little pollution 1. Only accessible in limited places Biomass- fuel from plant or animal material (most common is wood) Flexible Can be used to make other fuels 1.Air pollution

Secondary sources of energy are used to store, move, and deliver energy in usable form. They are sometimes called energy carriers. Examples are electricity and hydrogen.

Virginia exports more coal than it imports. Virginia’s coal mines produce only 5% of the coal east of the Mississippi River. Virginia’s electricity- About 1/3 is generated by four nuclear power plants About ½ is generated by coal Virginia has two of the top methane fields, almost 6,000 natural gas wells, and three oil wells.

The United States is the 2nd largest energy consumer in terms of total use in 2010 and 7 th largest in per capita energy consumption. The majority of this energy comes from fossil fuels.

Energy Dependence Modern industrialized society is dependent upon energy. Fossil fuels are the major source of energy in developed and industrialized nations. Some important sources of energy include, fossil fuels, wood, wind, water hydropower), the Sun solar), and Earth’s interior.