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Do Now #5 Earth’s Oceans

Wel come back!!!. Do Now #5 Earth’s Oceans. Pg. 374. Pg. 374 – No test this week . What percentage of Earth’s surface is covered in water? The global ocean is divided into what 5 main oceans? Explain how the first oceans formed. Why is the ocean salty? Define salinity.

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Do Now #5 Earth’s Oceans

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  1. Welcome back!!! Do Now #5Earth’s Oceans Pg. 374

  2. Pg. 374 – No test this week  • What percentage of Earth’s surface is covered in water? • The global ocean is divided into what 5 main oceans? • Explain how the first oceans formed. • Why is the ocean salty? • Define salinity.

  3. Pg. 374 – No test this week  • If you evaporate 2 kg of ocean water, what amount of solids would remain? (Look at the section – “chock-full of solids) • Why is coastal water in hot, dry climates more salty than coastal water in cooler places? • Describe how temperature changes as you go deeper into the ocean. Use the following vocabulary words… • Surface zone • Thermocline • Deep zone

  4. Why are the parts of the ocean that are along the equator warmer than the parts of the ocean that are along the poles? • How does the ocean act as a “global thermometer?”

  5. CT lab: • How do scientists enter & leave underwater labs? • Materials: • bowl, jar, water • Procedure: • Fill a large bowl about 2/3 full of water • Turn your clear cup upside down • Slowly guide the cup straight down into the water. • *be careful to tilt/tip the cup!* • Record your observations. • Analysis: • How does the air inside the cup affect the water below the cup? • How do your findings relate to the hole in the bottom of an underwater research lab?

  6. Homework: Section Review questions pg. 381, #1-10

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