_________ resources can be replaced faster than they are used.

A type of rock that form when sedimentary and igneous rocks change under heat and pressure is a __________.

_________ is a mixture of bits of rocks and once-living parts of plants and animals.

The type of rock that forms from layers of sediment is a ___________.

A __________ is a solid natural material made from nonliving substances in the ground.

Any source of energy other than fossil fuels is known as ___________.

What are the most common fossil fuels?

About three-fourths of Earth's surface is covered with water, with most of it in ________.

The type of rock that forms from magma or lava that cools and hardens is an ___________.

____________ resources are resources that can be used up faster than they are made.

The change that occurs over time of one type of rock to another is called the ___________.

__________ is a type of air pollution caused by particles from cars and factories.

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