Once in our world, there was no Asia, Australia and OCeania, Africa, Europe, North America, South America, nor Antarctica. There was no Pacific, Indian, Atlantic, nor Arctic Ocean. There was only Pangaea, one land, and Panthalassa, one big body of water. However, through the years, the forces of nature moved them apart- creating many islands and thereby dividing the waters. Along with the movement of land masses, different land transformations occurred. With the existence of mankind, a vast number of dramatic land transformations were recorded. But there also are, however, little or almost negligible changes, some of which are caused by weathering.
Weathering is basically the breakdown of rocks. It may be achieved via physical or chemical means. Chemical means of weathering involve components which cause a change of identity in the rock surfaces those chemicals come in contact with. Once these portions of the rock are changed, some become more brittle creating weak points in the rock, which eventually leads to its breakdown. You already expect a lot from chemical weathering given that it involves chemical reactions. In a way, some sort of "magic spell" is applied to the rock which causes its weakness. Physical weathering is a bit more fascinating, however. Physical weathering involves a slow process in the breakdown of rocks. It involves cumulative weak forces in long periods of time. As an example, imagine a cemented path under a dripping ceiling everytime it rains. All you could notice are little puddles forming where the droplets of water meet the cement. But as time goes by, you notice a little deformation on the cement being hit by the droplets. It takes time. It is a seemingly very little effort. But it made a difference.
(HIgh Speed Water Splash Photography) |
eSchool Today |
This rock was once larger but has been weathered by wind and rain over time. (Oak Ridge Elementary) |
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