This natural resource can take hundreds of year to form and can easily be eroded.

What was often used as an energy source when factories began mass producing clothing, furniture, and farm machines?

Forests play an important role in controlling the ______________.

What was used by scientists to show how much humans have affected the Earth's ecosystems?

What energy is from the heat inside the Earth?

What produces most of the energy that is used in the United States?

Where was the energy released from fossil fuels originally captured from?

This is a fossil fuel that is formed from the remains of tiny ocean organisms?

A cost for using lumber to build houses would be ______ might lose their_______.

_________________ is when gases produced by burning fossil fuels trap heat in the air.

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