Chapter 30 NEW Winter 2011

Chapter 30 NEW Winter 2011 - Quiz NEW Chapter 30 Surface...

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Unformatted text preview: Quiz NEW Chapter 30 Surface Processes How did your reading comprehension go? a) Just fine b) Pretty OK c) OK d) Pretty bad e) Really bad Did you read NEW Chapter 30 for today? a) Yes b) No Quiz Compare the writing style with earlier chapters a) Much easier to understand b) Somewhat easier c) About the same d) Somewhat harder e) Much harder Take away points Understand the source of energy that drives the hydrological cycle Understand how energy conversion causes rivers to create both canyons and deltas Understand Understand how different parts of the hydrological cycle can cause different geological features Atmospheric Circulation Habitable zone of our Sun. Solar radiation produces differential heating of the Earth (sphere) less –Air masses move to balance global T Earth’s Location in this Zone allows water to exist as a liquid on the surface –Warm air rises/cold air sinks more www.astro...state.edu/ ~poggeAst161/ Unit7/life.html Circulation Patterns less The Hydrologic Cycle The cycling of water between the oceans, land, atmosphere, and mantle of the earth is called the Hydrologic Cycle. Water Breakdown Gradient Rocky Mountains = 50m/km Mississippi = 2cm/km Erosion of the Colorado River Grand Canyon, AZ Deposition of the Mississippi River Delta by the Mississippi River Salt Salt Lake City, 1983 Floodplains are for Floods! STATE STREET ManMan-made levees Parts of the Hydrologic System Ice Ice Systems • Flow of water is very slow as a solid. • Water can be “trapped” for 10,000 10,000 years years • 80% of Earth’s fresh water, but only 2% of Earth’s total water water Valley Glaciers •Nearly 200,000 valley glaciers •Only a few percent of all ice on Earth Continental Glaciers • Continent-sized Continent• Antarctic ice sheet is over 4500 m thick • 95% of all ice: • Antarctica & Greenland Parts Parts of a Glacier plucking Zone of accumulation (snowing) abrasion Zone of ablation (melting) Glacially carved surface in southern Ontario, Canada Glacial Lake Bonneville Lake Bonneville Shorelines in Northern Utah Alpine Level Provo Level BYU sits on the Provo level of the lake. Parts Parts of the Hydrologic System Water Table Moves slowly compared to rivers Groundwater Groundwater Systems • Largest source of fresh liquid water ~20% Tapping Groundwater Aquifers Confined Aquifers: the permeable layer is enclosed by impermeable layers (i.e. – shale). “Artesian” Parts of the Hydrologic System Shoreline Shoreline Systems • Wave action modifies the interface between between oceans-large lakes and the land land Natural Natural Discharge Springs What drives the hydrologic cycle? a) Energy from the sun reflects off of the poles, which causes wind, pushing water toward the equator b) Energy from the sun is primarily absorbed by land, which evaporates water and deposits it in the ocean c) Radiation from the sun heats the equator more than the poles, causing evaporation and convection cells d) The sun’s radiation melts glaciers. As they flow, potential energy is converted to kinetic energy, causing evaporation. ...
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