Chapter Two, Section 2
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Chapter Two, Section 2

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Geo: Chapter 2, section 2

Geo: Chapter 2, section 2

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Chapter Two, Section 2 Chapter Two, Section 2 Presentation Transcript

  • Chapter 2, Section 2
  • The Reality of the H 2 the IS 0!
    • No freshwater, no saltwater = no life
    • Water supports plants, animals
    • Helps distribute heat on earth
  • Oceans and Seas
    • Salt water covers 71 % of planet
    • (60 % of Northern Hemisphere, 81% of Southern Hemisphere)
    • Atlantic, PACIFIC, Indian, Arctic
  • Ocean Motion
    • Salt water circulates through 3 basic motions:
    • Currents - act like rivers flowing through ocean
    • Waves - ridges produced by winds
    • Tides - rises and falls of the ocean created by gravitational pull of moon or the sun
    • Oceans help distribute heat on the planet; winds blow over ocean and are either heated or cooled by water, then blow over land, which moderate temperature of air over the land
  • HYDROLOGIC CYCLE
  • Hydrologic cycle: what happens?
    • Water evaporates into the atmosphere from oceans, bodies of water, and plants (the water exists in atmosphere as vapor)
    • Vapor cools, condenses, and falls to earth as precipitation, rain, or snow
    • Water soaks into the ground, evaporates to the atmosphere, or flows into rivers to be recycled
  • Lakes, Rivers, and Streams
    • Lakes = 95% of all earth’s fresh water supply
    • Largest --Lake Baikal in Russia (totaling 18% of all freshwater on earth)
    • Freshwater lakes are result of glacial action thousands of years ago
    • Saltwater lakes result from changes in earth’s surface that cut off outlets to the sea - form when creeks and rivers carry salts, but no outlet
    • Largest salt lake: Caspian sea --Western Asia
  • Un poco mas…
    • Drainage basin: an area drained by a major river and its tributaries
    • Ground water: water held in the pores of rocks
    • Water table: level at which the rock is saturated - can rise or fall depending on amount of water pumped out of ground
  • Activity: IDENTIFY THIS and THAT
    • Now, turn your book to page 34 and 35. Mr. Philen is going to show you a variety of pictures of landforms, identify them…
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  • What landforms exist in Senegal? In Africa?
    • How could we draw a landform map for Senegal?
    • What elements would we include?
  • Continental Landforms
    • Relief: difference in elevation of a landform from its lowest point to its highest point
    • Four categories: mountains, hills, plains, plateaus
  • Continental Landforms you need to know
    • Volcano -mountain
    • Strait -valley
    • Island -glacier
    • Cape/peninsula -cataract
    • Bay -canyon
    • Swamp -cliff
    • Flood/plain -plateau
    • Marsh -mesa
    • Oasis -prairie
    • Steppe
  • Oceanic Landforms
    • There are landforms similar to the land on the sea floor
    • Continental shelf - earth’s surface from edge of a continent to the deep part of the ocean
    • Ocean floor contains ridges, valleys, canyons, plains
    • Longest: Mid-Atlantic Ridge
    • Islands can form from volcanic action
  • Questions for thought
    • 1) How do the winds and the ocean distribute heat on the earth’s surface?
    • 2) Why is water such a valuable renewable resource?
    • 3) Describe what happens with the hydrologic cycle.