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13.1 The Water Cycle

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by

Katelynn Dorn

on 21 November 2014

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Transcript of 13.1 The Water Cycle

The Water Cycle
continuous movement of water from atmosphere to earth's surface and back again
evaporation- process of liquid water changing into water vapor (500,000 km cubed every year--86% from ocean)
transpiration- plants give off water vapor
evapotranspiration
runoff- water flowing over land into rivers
groundwater
The Water Cycle (cont.)
condensation- water rises in atmosphere, expands, and cools (forms clouds)
precipitation- water falls from clouds to earth
Life Cycle of a Lake
water may collect in a depression on land
Lake basins may be destroyed if filled by sediments
organic deposits from vegetation may also accumulate in shallow lakes.
A bog or swamp may form, and eventually become dry land
Water Budget
precipitation is the income
evapotranspiration and runoff are the expenses
local water budget
factors- temp., vegetation, wind, rainfall
Water Conservation
95 m cubed a year
most water in U.S. is used to irrigate crops
90% of water used by cities becomes waste water
WI uses 2 trillion gallons of water a year
conservation- anti-pollution laws, education
desalination- turning ocean water into fresh water
13.1 The Water Cycle
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