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The Water Cycle - PowerPoint PPT Presentation


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The Water Cycle. The energy from sun drives the water cycle which in turn drives the weather. Weather is affected by the amount of water vapor in the air. Water never leaves the Earth. It is constantly being cycled through the atmosphere, ocean, and land.

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Presentation Transcript
slide2
The energy from sun drives the water cycle which in turn drives the weather.
  • Weather is affected by the amount of water vapor in the air.
slide3
Water never leaves the Earth. It is constantly being cycled through the atmosphere, ocean, and land.
  • This process, known as the water cycle, describes the movement of water above, on and below the Earth’s surface.
  • The water cycle is crucial to the existence of life on our planet.
slide4

Evaporation

The sun heats up liquid water and changes it to a gas (water vapor) by the process of evaporation. Water that evaporates from Earth’s oceans, lakes, rivers, and moist soil rises up into the atmosphere.

slide6

The process of evaporation from plants is called transpiration. (In other words, it’s like plants sweating.)

slide8

Humidity – is the amount of water vapor in the air.

RELATIVE HUMIDITY-Amount of water vapor in the air compared to the maximum it can hold

The warmer the air, the more water vapor it can hold.

when a large amount of water vapor condenses it results in the formation of clouds

As water vapor rises higher in the atmosphere, it starts to cool to it’s dew point and become a liquid again. This process is called condensation.

When a large amount of water vapor condenses, it results in the formation of clouds.
slide11
When the water in the clouds gets too saturated ,the water falls back to the earth’s surface. This is called Precipitation.

Rain

Sleet

Snow

Hail

slide13
When rain falls on the land, some of the water is absorbed into the ground through the process of Percolation.
  • This water can either be :
  • Be used absorbed by plant roots
  • Stored in aquifers as Ground Water
slide14

RUNOFF – Water that flows across the land and collects into streams, rivers and eventually oceans. Water that collects in rivers, streams, and oceans