Climate
Long-term trends in the weather
Earth is known to have undergone drastic climate changes
Surface vegetation has evolved a dependence on the seasonal variation of the weather, and sudden changes lasting only a few years can have a dramatic effect, both on the vegetation and on the animals which depend on its growth for their food.

Beneficial and harmful effects
Weather can have both beneficial and harmful effects. Extremes in weather, such as tornadoes or hurricanes and cyclones, can expend large amounts of energy along their paths, and produce devastation. Surface vegetation has evolved a dependence on the seasonal variation of the weather, and sudden changes lasting only a few years can have a dramatic effect, both on the vegetation and on the animals which depend on its growth for their food.
Climate influence
Climate is a measure of the long-term trends in the weather. Various factors are known to influence the climate, including ocean currents, surface albedo, greenhouse gases, variations in the solar luminosity, and changes to the Earth’s orbit. Based on historical records, the Earth is known to have undergone drastic climate changes in the past, including ice ages.
Weather is a chaotic system that is readily modified by small changes to the environment, so accurate weather forecasting is limited to only a few days.
Drastic climate changes
The major oceanic divisions are defined in part by the continents, various archipelagos, and other criteria, these divisions are, in descending order of size:
The Pacific Ocean
The Atlantic Ocean
The Indian Ocean
The Southern Ocean
The Arctic Ocean
Smaller regions of the oceans are called seas, gulfs, bays and other names. There are also salt lakes, which are smaller bodies of landlocked saltwater that are not interconnected with the World Ocean. Two notable examples of salt lakes are the Aral Sea and the Great Salt Lake.
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