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The process of encroachment/invasion of deserts into regions that were once productive is termed as?

What is a fiord, and how does one form?

The approximate percentage of the Earth’s surface that is covered by water is about:

A lake formed within a cirque is called a(n):

Groundwater erupting from geysers that contain dissolved calcium carbonate will form deposits of:

The percentage of the Earth’s water that is fresh water that is not frozen is:

The approximate percentage of Earth’s water that is in the oceans is:

Narrow surface currents that flow in the same general direction as the approaching waves are:

When flow is restricted to long, trough-like depressions, the flow is known as ____________________ flow.

Vertical ocean circulation is the result of differences in what between adjacent water masses?