Precipitation is another facet of the hydrosphere that impacts climates. Clouds, rain, snow, sleet, and hail are all part of the hydrosphere. Most water vapor that becomes precipitation is evaporated from the oceans, though smaller amounts also come from rivers, lakes, soil, and vegetation. The amount of precipitation an area receives greatly determines its climate. Desert areas receive very little precipitation, whereas rainforests receive a great deal of precipitation. In general, low pressure areas receive more precipitation while high pressure areas receive less precipitation.