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