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Science, Chapter 6, Unit B
Lesson 1Where is Earth’s water?
Water• Water covers ¾ of Earth’s surface• 3 states• Solid-ice• Liquid-water• Gas-water vapor
How many oceans are on earth?
• Although the oceans of the earth are all connected and truly one "World Ocean," most often the world is divided into four major "oceans" - the Pacific Ocean, Atlantic Ocean, Arctic Ocean, and the Indian Ocean.
• Some consider there to be five oceans - the fifth being an ocean surrounding Antarctica called the Antarctic Ocean or Southern Ocean.
Salty Water• Ocean water is salty – Cannot drink– Sodium chloride (table salt)
• Water is made up of – Hydrogen– Oxygen
• H2O
• Ocean Water Mixture of:– Water– Dissolved solids (rocks and soils)
Fresh Water
• Found in:– Rivers– Lakes– Polar ice caps– Glaciers– underground
Most of Earth’s fresh water is found here
Saltiness
• Not the same in all oceans• Speed water turns to water vapor
• Saltier– Warm, dry areas– Turns water to water vapor rapidly
• Less salty– Cool temperatures– Near North and South Poles– Turns water to water vapor slowly– Locations • near rivers• Heavy rainfall• melting ice
Add fresh water to oceans, Makes ocean water less salty