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In geology, the term sial refers to the composition of the upper layer of Earth's crust, namely rocks rich in aluminium silicate minerals. It is sometimes equated with the continental crust because it is absent in the wide oceanic basins, but 'sial' is a geochemical term rather than a plate tectonic term.
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Natural bridge<span>, </span><span>also called </span>natural arch<span>, naturally created </span>arch formation resembling a bridge. <span>Most </span>natural bridges<span> are </span>erosion<span> features that occur in massive, horizontally bedded sandstone or </span><span>limestone</span>M<span>ay be produced by entrenched rivers eroding through </span>meander<span> necks to form cutoffs. Still others are produced by exfoliation and may be enlarged by wind erosion. </span>
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In 1619, the first representative legislative assembly in the New World met at the Jamestown church. It was here that our American heritage of representative government was born. Since New England was outside the jurisdiction of Virginia's government, the Pilgrims established a self-governing agreement of their own, the "Mayflower Compact."
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