Review Essay Example | Topics and Well Written Essays - 500 words - 11

Review - Essay ExampleThese theories be concerned with the bombardment of the body politic by icy clumps of material (30), or planetismals. This collision results in the formation of steam in the atmosphere. aft(prenominal) some steam being ejected into the sky, and some being split by ultraviolet radiation, sufficient steam the Great Compromiser in the atmosphere to condense and form the oceans when the Earth cools. The origin of these planetismals is subject to different viewpoints. They are variously argued to be asteroids, comets and meteorites.Plate tectonics is responsible for the creation and present configuration of the ocean basins, which perform as containers to hold water. This process agitates the Earths mantle, separating it into the lighter granitic rock which floats on merry-go-round to form the continents, and the heavier basalt which sinks to form the ocean basins.The Earths orbit is another important factor for the armorial bearing of water. To one side of t he Earth, Venus is so close to the sun, that water evaporates skyward, and is split by the suns ultraviolet rays into hydrogen which is lost into the sky. On the other side, Mars is too far from the sun and remains frozen imputable to runaway glaciation. Unlike its neighbors, the Earths orbit lies in the habitable zone, with regard to its distance from the sun, thus permitting the presence of liquid water.The Earths stratified atmosphere, due to the strong presence of carbon-dioxide and methane, which absorb infrared radiation, results in the greenhouse effect, keeping the planet warm even during the suppurate of the early, faint sun. This prevents the loss of water and hydrogen into the sky.Volcanism is the last factor which contributes to the presence of water on Earth, due to the carbonate-silicate cycle. Volcanism gives the Earth a built-in (geochemical) thermostat (33), which regulates the Earths climate and maintains the surface temperature in a range