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seasonal variation of the climate, and sudden changes lasting just a few years can have a dramatic effect, each on the vegetation and on the animals which depend on its development for his or her meals. Terrestrial climate occurs nearly completely within the lower a part of the environment, and serves as a convective system for redistributing heat. Ocean currents are another important factor in figuring out climate, particularly the most important underwater thermohaline circulation which distributes warmth vitality from the equatorial oceans to the polar regions. These currents help to average the differences in temperature between winter and summer within the temperate zones. Also, without the redistributions of heat power by the ocean currents and atmosphere, the tropics could be a lot hotter, and the polar areas much colder. Since the Cambrian explosion there have been 5 distinctly identifiable mass extinctions. The final mass extinction occurred some 66 million years in the past, when a meteorite collision probably triggered the extinction of the non-avian dinosaurs and other massive reptiles, but spared small animals such as mammals. Over the past sixty six million years, mammalian life diversified. During the Neoproterozoic era, freezing temperatures covered a lot of the Earth in glaciers and ice sheets. This hypothesis has been termed the “Snowball Earth”, and it’s of particular interest because it precedes the Cambrian explosion in which multicellular life types started to proliferate about 530–540 million years in the past. Earth is estimated to have formed four.54 billion years in the past from the solar nebula, along with the Sun and other planets. The moon shaped roughly 20 million years later. Initially molten, the outer layer of the Earth cooled, resulting within the strong crust.

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