soil that is rich in humus has high

Living organisms in soil help to

What term describes the management of soil to prevent its destruction

When are the tides highest

The three major fossil fuels are coal, oil, and

A volcano that may erupt again at some time in the distant future is

One of the conditions required for life on Earth is

Tides are caused by

As you descend (go down) through the water column

Earth's rotation makes global winds curve. This is called the

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