Nature is a perfect system of balances. Matter and energy exist in finite (specific) amounts and cannot be created or destroyed. The earth is a perfect example of nature's balance system. Rock particles are eroded from the mountain top, deposited in valleys or stream channels, compacted under their own weight into rock, and uplifted by mountain-building processes until they again rise to th…
Scientists and mathematicians began to speculate on the thickness of the earth's crust and distribution of land masses in the mid 1800s. Sir George Biddell Airy (1801-1892) assumed that the density of the crust is the same throughout. Because the crust is not uniformly thick, however, the Airy hypothesis suggests that the thicker parts of the crust sink down into the mantle while the thinne…
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