An energy resource is a resource that humans can use to make food or beverages.

Petroleum is a fossil fuel that can be used to make plastics.

Which of the following describes how microorganisms influence the chemical characteristics of soil?

What is humus?

Leaves release acids into the soil as they decay. How could decaying leaves affect rock in the soil beneath them?

Which of the following is the source of humus found in soil?

In which of the following soil layers is humus mostly found?

What is the original source of the energy stored in coal?

Which is one of the disadvantages of using fossil fuels as an energy resource?

Why is nuclear energy considered to be a nonrenewable energy resource?

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