Sec.%202:%20Earth

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Sec. 2 Earths Bodies of Water

• Streams and Rivers
• Bodies of water that flow over land
• Sources vary from snow melt, glacier melt, or
  over flowing rivers
• Small streams tributaries
• River systems are made up of a river and its
  tributaries

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• Longest riverNile
• Largest river system Amazon
• Rivers drain the land around them drainage basin
• Most of the worlds early population settled
  along rivers
• rivers provide water for drinking, cleaning,
  source of food, energy and good for
  transportation and trade

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Lake formation

• Lakes
• Exist on all continents except Antarctica
• Often lakes were formed by the holes that
  glaciers gouged out of the mountain

• Lakes can also form when rainwater collects in
  huge holes created by
• Extinct volcanoes
• In Rifts large cracks in the Earths crust

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• Manmade lake
• Reservoir- the lake that forms once a dam has
  been built on a river

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Earths Ocean

• The four oceans by size
• Pacific, Atlantic, Indian, Artic
• Land beneath the surface of the ocean
• Mountains
• Broad plains and basins
• Long deep valleys

• Trenches are deep valleys beneath the surface
• Deepest is the Mariana Trench
• 7 Miles Deep
• Current-Streams of ocean water
• Started by the wind
• Move Clockwise in NH and counter clockwise in the
  SH

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• Ocean Waves- Can Be small or very large
• Tidal Waves- are giant waves caused by
  earthquakes and severe storms
• Tides- caused by the pull of the moon and sun
• Tides are the regular, rhythmic rise and fall of
  the ocean waters

• Other parts of the ocean are made up of . . .
• Smaller bodies of water called seas, straits,
  gulfs, and bays
• These are located around the edge of the ocean
• They are salt water

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• The water we Drink
• The ocean covers more than 140 Million Square
  miles
• 99 of the worlds water supply is unsafe to
  drink
• Ocean water Too salty
• Glaciers contain 70 of the Earths fresh water
  and we cannot access it

• 6 of the Earths fresh water is in lakes and
  rivers
• The Water Cycle
• Replaces fresh water continuously

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