求翻篇英语文章 谁来帮下我要人工的谢谢啊

求翻篇英语文章 谁来帮下我要人工的谢谢啊
Convective flow should be familiar to anyone who has noted the boiling of a heated liquid.The most elementary type of convection can be explained by the fact that heat rises.In the simplest cases,convective flow begins
when a fluid is heated from below.As the bottom layer of the fluid is heated,it expands and thus becomes less dense than the layers above.The warmer and lighter bottom layer then tends to rise and the cooler layer
tends to sink in a continuous cycle.The same mechanism of convective flow s responsible for the great ocean currents and for the global circulation of the atmosphere.In an ocean,the water is warmed by the sun to a depth of perhaps thirty meters,and evaporation near the water's surface is responsible for the cooling effect.