Explain that glaciers not only are found in polar regions like Antarctica and Greenland, but mountain glaciers exist even at the equator.
Glaciers can have an enormous effect on sea level around the world.
If global warming occurs, some scientists theorize that melting glaciers in the next century could cause a rise in the sea level worldwide. Over the last 25,000 years glaciers have had an even greater effect on our global landscape than earthquakes, volcanoes, hurricanes, or floods. But because they flow so slowly, they are often overlooked as a significant agent of change. A glacier is a large mass of ice that acts like a river, flowing downhill under the influence of gravity. As long as new snow is added at the top, a glacier will continue to move forward.