sec 1 geog unit 4 lesson 2
DESCRIPTION
Sec1 Geog Water Lesson 2TRANSCRIPT
Chong Boon Secondary Geography Department
Sec 1 GeographyUnit 4 Lesson 2
Water Supply: Locations facing water shortage.
Thinking questions
• Where is water stored globally?• What are countries that are facing
water shortages?
Lesson Objectives
• In this lesson, you will–The global distribution of water.
Distribution of water on earth.
• 71% of earth’s surface is covered with water.• Most of the earth’s water is salt water.• 2.8% of the earth’s water is fresh water.• 1% of the fresh water is surface water in rivers
and lakes.• The total amount of easily obtained fresh
water is very little!
Oceans
• All the world’s oceans are interconnected.• This is divided into 5 main oceans.1. Pacific Ocean2. Atlantic Ocean3. Indian Ocean4. Arctic Ocean5. Southern Ocean
Turn to Pg 133
Name : ( ) Perserverance 1/2/3 Date:
Groundwater
• Groundwater is water stored underground in soil and underlying rocks.
• Collected when rain infiltrates the ground.
• Wells allow us to access groundwater.
Groundwater sources
• Most groundwater is found in Africa and South America.
• South East Asia has a relatively large supply.• Surface fresh water is more commonly used as
it is easier to access. • Groundwater is commonly used for irrigation.– 38% of water for irrigation is groundwater.
Ice caps & glaciers
• Ice cap is a continuous mass of ice covering the top of mountains and elevated areas.• Glaciers are bodies of ice that
move down a slope due to gravity.
Rivers
• Large natural stream of fresh water• Flows along a definite course into another water
body.• Starts at the source (upper stream)• Ends at the mouth (into a water body)• Tributaries are smaller rivers that feed the main
river.• Distributaries are smaller rivers that discharge
water from the main river.
Let’s try a simple exercise
• Turn to Pg 137 of your textbook.
Lakes
• A body of water occupying a hollow in the earth’s surface.
• The largest freshwater lakes by surface area are the Great Lakes of North America.
• Pg 138
Great Lakes of North America
Let’s do a summary exercise