Earth’s Water Lesson 1 - Thomas County School District
Transcript of Earth’s Water Lesson 1 - Thomas County School District
How is water distributed on the
Earth?
_______of the world’s Water supply is ocean (salt water).
_______of the world’s water supply is frozen in icecaps and glaciers.
How is water distributed on the Earth?
________ of the world’s water supply is non-consumable water on land.
_______ of the world’s water supply is freshwater available for consumption.
Pacific Ocean
• The largest ocean. It is larger
than all the land put together.
• It contains 48% of the world’s
seawater.
• The deepest ocean because the
Mariana Trench is located in it. (over
36,000 feet deep)
Atlantic Ocean
• The second largest ocean.
• It contains 23% of the world’s
seawater.
• Most traveled ocean
routes.
Southern Ocean
• The newest ocean.
• Recognized in 2000.
• It contains icebergs and deep
continental shelves.
World’s Freshwater
Groundwater: water that collects between bits of rock and soil.
What factors affect the groundwater?
(Globe – pp. 210)
How does groundwater reach
the Earth’s surface?
Water may reach the surface through wells, springs, or geysers.
What is the main difference between a spring and a geyser?
(Globe – p. 212)
What is the difference between
a river and a lake or pond?
Rivers or streams are running
water.
Lakes or ponds are still water.
90% of the continental surface
water is found in lakes.
What is the difference
between a gulf and a sea?
A sea is a smaller body of water connected to or near an ocean.
A gulf is a large area of ocean reaching into the land.
Salinity is the amount of dissolved salts in ocean water.
Fresh water from rivers, precipitation and glaciers will lower the salinity of the water.
Evaporation during the day will cause the salinity to rise.
Sodium chloride
(NaCl) is the main
mineral in ocean
water. Most of the
minerals come from
the weathering of
rocks on land. Rivers
bring the minerals to
the ocean.
2. Temperature layers
The ocean can be divided into three
layers based on temperature.
A. Surface: Sun heats this layer.
Constant winds and waves keep
it circulating so little temperature
variation within layer.
2. Temperature layers
B. Thermocline: Temperature
drops sharply with depth. Drops
faster than in other two layers.
300-700 meters below sea level.
C. Deep: Average temperature is 2
degrees Celsius.