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When Were the Ice Ages?
The Ice Ages ended about 10,000 years ago after lasting about two million years. At its greatest extent the ice covered nearly 30 per…
Where Is Lake Superior?
Lake Superior, the largest of the five Great Lakes in North America, is located between the United States and Canada. It covers an area…
What Is Shale?
Shale is a fine-grained, earthy, sedimentary rock rather like clay, but, unlike clay, it is formed in thin layers. It is usually harder than…
When Does a River Flow Underground?
An underground river is formed when the top soil of the land makes it extremely easy for water to pass through to a more…
What Makes a River Bend?
A river always takes the easiest course through channels and soft ground to the sea, flowing swiftly down mountain sides but much more slowly…