Transcript watercycle powerpoint

AIM:
How does Earth’s water move
through the Water Cycle?
Earth’s surface is covered mainly by water.
• Oceans cover about 70% of our planet’s surface.
What is the Water Cycle?
Earth has been recycling its water supply for 4 billion
years.
• The Water Cycle is the continuous process by
which water moves from Earth’s surface to the
atmosphere and back.
• Driven by energy from the SUN.
3
3
2
Processes of the Water Cycle
1. The Sun heats up the water in Earth’s oceans and
lakes.
Processes of the Water Cycle
2. Evaporation: liquid water changes to a gas called
water vapor.
Processes of the Water Cycle
• Transpiration: water vapor is released by plants.
Processes of the Water Cycle
• Respiration: As animals breathe small
amounts of water vapor are released.
Processes of the Water Cycle
3. Condensation:
• Warm air carries water vapor
upward.
• The air cools and condenses
into liquid water.
• Convection: Warm air rises
and cold air sinks.
• Tiny droplets of water clump
together around tiny dust
particles in the air, forming
clouds.
Licancabur Volcano is located on the border between Chile and Bolivia.
• If a cloud is on, or just above, Earth’s surface, it is
called FOG.
Processes of the Water Cycle
4. Precipitation:
• As more water vapor condenses, the drops of
water grow larger and heavier.
• The heavy droplets
fall as precipitation
(rain, snow, sleet,
hail).
Processes of the Water Cycle
5. The precipitation that falls on land may:
• soak into the soil and become groundwater
OR
• Run off the land, eventually flowing back
into the ocean.
Water that falls on the surface may run off into
rivers and streams, eventually flowing back to a
lake or ocean.
Water
Cycle
Video
How is Earth’s Water Distributed?
• About 97% of Earth’s
water is salt water
found in oceans.
• Only 3% is freshwater.
How is Earth’s Water Distributed?
• Oceans: the Pacific, Atlantic, Indian, and Arctic
Oceans are all interconnected, covering the
majority of Earth’s surface.
How is Earth’s Water Distributed?
• Ice: most of Earth’s freshwater is locked in thick
sheets of ice near the Earth’s poles.
How is Earth’s Water Distributed?
• Rivers and Lakes: Only 0.02% of Earth’s water, but
an important source of freshwater for people who
live near them.
The Great Lakes contain
almost 20% of all the
water in Earth’s
freshwater Lakes
How is Earth’s Water Distributed?
• Groundwater: water that fills the cracks and
spaces in underground soil and rock layers.