Why Are There Many Kinds of Soils?
Soil is one of the principal substrata of life on Earth, serving as a reservoir of water and nutrients, as a medium for the…
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Earth
When Did the Rift Valleys Form?
The great rift valleys of the earth took shape during the pleistocene age, about two million years ago. They were caused mainly by volcanic…
Why Is There More Sea than Land on the Earth’s Surface?
The earth’s crust is made of rocks that make the surface more sea than land. The composition of the rocks which make up the…
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…
Is the Moon Moving Farther Away from Earth?
As the Moon travels around Earth, it affects Earth’s rotation. Scientists have determined that the Moon slowly gets farther away from Earth at the…