Overview / 简介: |
| Even though Mount Everest measures 29,028 feet high, it may be growing about two inches a year. A mountain might be thousands of feet high, but it can still grow taller or shorter each year. Mountains are created when the huge plates that make up the earth's outer shell very slowly pull and push against one another. Read and find out about all the different kinds of mountains. |
Foreign Customer Review / 国外客户评价: |
| This book pretty accurately presents a simplified version of the current theory on mountain formation. According to the UC Berkeley department of Geology, the asthenosphere is fluid: "These observations, along with many other studies of our planet, support the theory that underneath the Earth's crust (the lithosphere: a solid array of plates) is a malleable layer of heated rock known as the asthenosphere which is heated by radioactive decay of elements such as Uranium, Thorium, and Potassium. Because the radioactive source of heat is deep within the mantle, the fluid asthenosphere circulates as convection currents underneath the solid lithosphere." |
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