how much water evaporates from the earths land surface every year?
You may be thinking, sure…rain falls…..then it rises again in many different forms, completing a circle that keeps planet Earth awash in water. But how much of it actually falls? And how much rises again? These are not easy questions to answer, but with a fair amount of research scientists have got an answer. Most of the earth consists of water, there is much more water than there is land. About 70% of the earth’s surface is covered in water. But water also exists in the air as vapor and in aquifers in the soil, as groundwater. The total water supply of the world is 1.400.000.000 km3. (A m3 of water equals 1,000 liters.) Of the freshwater on Earth, about 2.200 km3 flows in the ground, mostly within half a mile from the surface. About 135.000 km3 of water can be found in the atmosphere as water vapor, in lakes, soil moisture, marshes and wetlands, rivers, plant and animals. Groundwater and fresh water stored in surface bodies and in the atmosphere represent an available resource of