Chapter 13 Earth's Fresh Water.pdf - www.ck12.org C HAPTER 13 HS Earth\u2019s Fresh Water Chapter Outline 13.1 WATER ON E ARTH 13.2 S URFACE WATER 13.3 G

Chapter 13 Earth's Fresh Water.pdf - www.ck12.org C HAPTER...

This preview shows page 1 - 4 out of 28 pages.

www.ck12.orgCHAPTER13HS Earth’s Fresh WaterChapter Outline13.1WATER ONEARTH13.2SURFACEWATER13.3GROUNDWATER13.4REFERENCESThis unusual view of the world is oriented on the Arctic around summer solstice, June 2010, when the region isbathed in daylight 24 hours a day. The Arctic Circle is marked by a faint circle in the image.Water appears in several forms in this image: as solid ice, liquid water, and atmospheric gases. Greenland has thehighest albedo (that is, it appears the brightest) because it is covered with an ice cap. Sea ice, found west and northof Greenland, appears as a pale gray-blue. Clouds are water vapor and appear throughout the area. Through theclouds, oceans, and possibly even lakes – liquid water – is visible.Courtesy o f Je f f Schmaltz/NASA0s Earth Observatory.earthobservatory.nasa.gov/IOTD/view.php?id=44524.Public Domain.414
www.ck12.orgChapter 13.HS Earth’s Fresh Water13.1Water on EarthLesson Objectives• Describe how water is distributed on Earth.• Describe what powers the water cycle and how water moves through this cycle.Vocabulary• condensation• evaporation• fresh water• groundwater• hydrologic (water) cycle• precipitation• reservoir• residence time• sublimation• transpiration• water vaporIntroductionWater is simply two atoms of hydrogen and one atom of oxygen bonded together. Despite its simplicity, water hasremarkable properties. Water expands when it freezes, has high surface tension (because of the polar nature of themolecules, they tend to stick together), and others. Without water, life might not be able to exist on Earth and itcertainly would not have the tremendous complexity and diversity that we see.Distribution of Earth’s WaterEarth’s oceans contain 97% of the planet’s water, so just 3% is fresh water, water with low concentrations of salts (Figure13.1). Mostfresh wateris trapped as ice in the vast glaciers and ice sheets of Greenland. A storage locationfor water such as an ocean, glacier, pond, or even the atmosphere is known as areservoir. A water molecule maypass through a reservoir very quickly or may remain for much longer. The amount of time a molecule stays in areservoir is known as itsresidence time.How is the 3% of fresh water divided into different reservoirs? How much of that water is useful for living creatures?How much for people?415
13.1. Water on Earthwww.ck12.org

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture