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Water Cycle Prezi

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Michael Miller

on 6 March 2013

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Transcript of Water Cycle Prezi

What is it?
The continuous movement of water from water sources into the air, onto and over land, into the ground, and back to the water sources. What are the steps?

Condensation Precipitation
Occurs when rain, snow, sleet, or hail falls from the clouds onto the Earth’s surface.

It is the primary connection in the water cycle that provides for the delivery of atmospheric water to the Earth.

Most precipitation falls as rain. Infiltration
The downward movement of water from the land surface into soil or porous rock.

Water can be filtered and cleaned as it passes through the soil or rock. Runoff
Is water, usually from precipitation, that flows across land and collects in rivers, streams, and eventually the ocean. Transpiration
The process by which plants release water vapor into the air through their leaves.

Transpiration accounts for approximately 10% of all evaporating water. Evaporation
Occurs when liquid water changes into water vapor.

Approximately 80% of all evaporation is from the oceans.

Evaporation is more intense in the presence of warmer temperatures. Condensation
Occurs when water vapor cools and changes back into liquid droplets.

This is how clouds form. Dew Point
The dew point is the temperature to which air must cool to be completely saturated.
Water vapor needs a place to condense on, like grass or a glass Relative Humidity

Relative Humidity: is the amount of moisture the air contains compared with the maximum amount it can hold at a particular temperature.

When air holds all of the water it can at a given temperature it is said to be saturated.

The higher temperature, the more water the air can hold. How to calculate relative humidity:
Actual water in the air / Maximum water the air can hold at that temperature x 100 = relative humidity
Suppose that 1 m³ of air at a certain temperature can hold 24 g of water vapor. However, you know that the air actually contains 18 g of water vapor. Calculate the relative humidity.
Example: 18 / 24 x 100 = 75% Runoff Runoff Watch the NOAA Water Cycle Video:

http://www.montereyinstitute.org/noaa/lesson07.html Relative Humidity vs Dew Point video

Watch this video comparing relative humidity to the dew point: The End :)
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