Almost three-fourths of the Earth's surface is covered in water. All living things depend on water for their survival. Think about the neighborhood where you live or go to school. That's part of the hydrosphere. Water in the oceans, clouds, lakes, rivers, and even underground is connected through the water cycle .
Water is used and reused again and again by living organisms.
If you surf, swim, ski or snowboard, you come into direct contact with the hydrosphere. In fact, you could not spend more than 48 hours without drinking water. Without it you'd be sunk. Human beings can affect the world's water supply.