water moves from the oceans to the atmosphere, from the
atmosphere to the land, and from the land back to the oceans.
the energy of the sun causes water in lakes, ponds, rivers
and oceans to change from liquid water to water vapor in a process called
plants lose water to the air in a process called
water vapor changes from a gas to a liquid in a process
called condensation. when water vapor condenses on dust particles in the air,
precipitation (rain, snow etc) returns the water to Earth’s
surface. water vapor does not contain any minerals, so precipitation is fresh
some precipitation soaks into the ground. groundwater is
absorbed by the roots of plants and is used by animals that live in the soil. some
water flows underground until it reaches the ocean or another body of water.
some precipitation flows along the surface of the land as
‘runoff’. In time, it reaches the ocean or other bodies of water, such as
lakes, rivers , and streams where it is used by human beings, animals and