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Earth History: There never has been a more exciting time for earth history scientists than today. The whole field is in explosive growth. New techniques are revealing new areas of research and new observations are leading to new and controversial theories of the earth history. At the same time, the study of the origin, history, and nature of the earth history is becoming less observational, or purely descriptive, and more experimental and quantitative. (See Feature Article: STUDYING THE earth history.)
Scientists looked to the study of the earth history's planetary neighbors for the possible answers to a variety of questions that have a direct bearing on our own planet. The four planets nearest the sun—Mars, the earth history, Venus, and Mercury—are all thought to have been formed by the same process, a gradual buildup of matter from the sun. Studying the earth history alone did not provide much information about its origin. The earth history's atmosphere has changed considerably because of chemical reactions, loss of the lighter gases, and the existence of plant life. Only by studying the nearer planets and noting their differences and similarities compared with the earth history could scientists hope to explain the earth history's history.
Volcanoes, the earth history's most spectacular displays of energy, are responsible for forming large parts of the earth history's crust. They give clues to the earth history's history and evolution, and to the nature of the earth history's interior. Soils formed by the weathering of volcanic rocks are so exceptionally fertile, that despite the danger large numbers of people often live in the shadow of volcanoes, and eruptions lead to major loss of life. |
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