What are they?

• They are materials that are replaced quickly in nature.

• Water,wind, sunlight, plants, and animals.

Alternative Energy Source

• It is a source of energy other than burning fossil fuels.

• Plants,animals, sunlight, geothermal energy, moving water, and wind.

Biomass

• Wood, crops, and animal waste are part of what we know as biomass.

• Burning biomass transforms stored energy into thermal energy.

• A type of fuel made from biomass is called biofuel.

Solar Energy

• It heats water and land.

• Solar power--> power obtained from solar energy to generate electricity using solar cells.

Geothermal Energy

• It is energy obtained form the Earth's interior.

• Water that lies deep inside Earth is heated.

• The thermal energy that is responsible for hot springs or geysers can be used toproduce electricity.

Hydropower

• It is energy that comes form moving water.

• Moving water is a valuable source of energy because it is readily available, plentiful, and easy to find.

• It is one of the oldest types of energy used by humans.

• Electricity produced by waterpower is called hydroelectricity (rivers, tides, and oceans).