Dams are needed for:

Methane gas produced by a landfill is one example of:

The energy source created in the Earth's core by the radioactive decay of natural elements is known as:

The energy source that produces the largest amount of useable energy but produces waste that must be monitored for thousands of years is known as:

This energy source is created by the fusion of hydrogen atoms into helium atoms:

Huge turbines harness the force of the wind to turn a turbine and generate energy:

The element required to make nuclear energy is:

Energy sources that produce tons of energy but have some negative side effects are known as:

Energy sources that can be continually produced and have few negative side effects are known as:

Light or radiant energy travels...

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