There are several hypotheses, including warming or cooling of Earth, changes in seasonal fluctuations or ocean currents, and changing positions of the continents.

有几种假说，包括地球变暖或变冷，季节波动或洋流的变化，以及大陆位置的变化。

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The apps show sea surface height, sea surface wind, areas of overfishing, oceanic currents, and other non-Google Earth projects that graphically illustrate Marine pollution.

这些应用可以显示洋面高度、海风、过度捕鱼的区域、洋流，以及显示海洋污染的非google Earth内容。

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Because of the rotation of the earth and the circulation of air currents, raindrops seldom fall in strictly perpendiclar lines.

由于地球自转与气流循环的关系，雨滴的路线很少是真正的垂直线。

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This would include that the sun is almost certainly the main driver (via ocean currents) of the Earth's climate.

BBC: Big problems need big solutions

Scientists have been puzzling for some time over exactly what combination of factors is preventing the earth getting even warmer - maybe changes in solar activity, ocean currents or emissions of aerosol pollution.

BBC: Flooding in York

Although scientists have long recognised that mid latitudes were warmer when dinosaurs walked the Earth, some researchers have held to the view - partly based on the previous shell data - that different ocean currents must have operated at the time, leading to warmer polar temperatures but, crucially, cooler tropical temperatures.

BBC: Dinosaurs felt the heat