The%20Water%20Cycle

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The Water Cycle
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Processes in the Water Cycle

• The water cycle is made up of 5 processes
• Evaporation/transpiration- water vapor entering
  the atmosphere (from large bodies or water or
  plants
• Condensation- when air cools down, it cant hold
  all the moisture so it forms liquid drops on
  surfaces
• Precipitation- when water droplets get too large
  and fall out of clouds back to the Earth
• Runoff- water that flows back to the oceans over
  the land

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The Water Cycle
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Where Freshwater is Found

• Atmosphere (water vapor)
• Streams/rivers
• Ponds/lakes
• Groundwater
• Glaciers and icebergs

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Groundwater

• Makes up 25 of freshwater
• Found underground
• If water fills all the spaces in the
  rock-saturated zone
• Permeable-water can pass easily through spaces in
  rocks
• Impermeable-water cannot pass through the rocks
  spaces
• Acquifer- a permeable layer of rock that is
  saturated with water

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Weathering and Erosion

• Erosion-the process that wears down and carries
  away rock and soil
• Weathering-process where rocks are chemically
  altered or physically broken down into fragments

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Erosion

• Ways that erosion can take place
• Gravity
• Movement of streams
• Groundwater
• Glaciers
• Wind
• Waves

Cliff eroded
Glacier erosion feature
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Gravitys effect
Groundwater eroding land
Wind erosion
Waves eroding base Of cliff
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Types of Weathering-Mechanical

• Mechanical weathering- physically breaking down
  rocks through
• Frost wedging- ice expands and cracks rocks
• Abrasion- when rocks scrape or grind against each
  other
• Growth of plant roots- gets in between rocks and
  cracks them

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Water gets into the spaces in a rock, expands
while it freezes and cuts through a rock
Wind eroding a hole through a structure
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Types of Weathering-Chemical

• Chemical weathering-chemical reactions dissolve
  the minerals in a rock or change them into new
  minerals
• Water is the main agent of chemical weathering

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Chemical eroding of ancient buildings