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A branch of geosciences, geology is the study of the materials that compose the Earth's crust. Geologists analyze rocks, formations and other structures in order to understand how the Earth has changed and evolved over time. Continue reading to learn about the educational requirements for entering this field.
Richard A. Lovett
The "Earthquake Machine" is a simple model of the earthquake process using a wood block, sandpaper, and rubber bands. This model shows how "Forces, Faults, and Friction" interact as elastic energy is slowly stored as the rubber back stretches and then rapidly released as the block jerks in an "earthquake".
(As reported by Don J. Miller in United States Geological Survey Professional Paper 354-C, Giant Waves in Lituya Bay, Alaska, 1960) Account of Howard G. Ulrich
Read more: " Special report: After Japan's megaquake " 0930 GMT, 12 March 2011 Sumit Paul-Choudhury, editor, newscientist.com There has been a massive explosion at the Fukushima-Daiichi nuclear power plant , raising fears of a radioactive meltdown.
So far scientists have not found a way to determine the exact age of the Earth directly from Earth rocks because Earth's oldest rocks have been recycled and destroyed by the process of plate tectonics. If there are any of Earth's primordial rocks left in their original state, they have not yet been found. Nevertheless, scientists have been able to determine the probable age of the Solar System and to calculate an age for the Earth by assuming that the Earth and the rest of the solid bodies in the Solar System formed at the same time and are, therefore, of the same age.