DO NOW HW DUE WEDNESDAY DEC. 14 TH

Transcription

1 DO NOW HW DUE WEDNESDAY DEC. 14 TH Read the Water Supply article under the Do Now section of your packet. Answer the reading comprehension questions that follow each section.

2 Hydrology: Earth s Water Supply

3 What is Hydrology? It is the study of the earth s water. It includes The water cycle The ocean floor Currents, waves and tides

4 The Water Supply The measure of how much water there is in the world and how much of it we can actually use. Brain Pop Water Crisis hsystem/watersup ply/

5 The Blue Marble: Earth s surface is 70% Water. Which type of water mostly covers the earth?

6 Water Breakdown on Earth 97% of all water is salt water 3% is fresh water 1% is usable 0.3% is drinkable

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8 but only 0.3% is ready to drink Demo: How much water is 0.3% actually?

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10 Shade our water on your own graduated cylinder: 90% Shade in green salt water 80% amount of our water 70% 60% 50% 40% 30% 20% Shade in dark blue the percentage of fresh water. Shade in purple the amount of usable water Shade in light blue the amount of drinkable water. 10% How much of our dark blue can we actually drink?===circle it!

11 DO NOW HW DUE WEDNESDAY DEC. 14 TH 1. How much of the earth is covered in water? 2. How much is drinkable? Salt? Freshwater? Usable? 3. Where is most of the fresh water found? 4. List the following in order from largest supply to smallest supply: liquid fresh water, salt water, solid fresh water.

12 Check for understanding: Challenge! List the percentages for the following types of water - Salt: - Usable: - Fresh: - Drinkable: List the following in order from largest supply to smallest supply: Liquid fresh water(lakes/rivers), salt water, solid fresh water (ice)

13 Stop: Critical Thinking What questions may we have at this point about our water on Earth s surface? --think how or why questions!! Read pg. 374 in the textbook on your desk. Write one sentence summary for each section.

14 Salt Water Oceans and Seas 3.5% salt concentration (3 times as salty as the human body) Salt=Sodium Chloride=NaCL Oceans make up most of Earth s water 5 oceans on Earth: Pacific Ocean Atlantic Ocean Indian Ocean Arctic Ocean Antarctic/Southern Ocean All the salt of the oceans could form a 500 feet thick layer across the Earth, about the height of a 40-story office building.

15 Why so salty?? Weathering breaks salt off of rocks on land. Everything eventually makes it way to the sea so erosion carries the salt to the seas. Salt is then deposited into the oceans where it remains (not evaporated or frozen left in the oceans!)

16 5 ocean world---- Sketch a quick map in your notebook and label the oceans. Challenge: Label the continents too!

17 Catalyst 1 st period 1. How much of the earth is covered in water? 2. How much is drinkable? Salt? Freshwater? Usable? 3. Where does the salt come from that is found in the oceans? 4. What is the name of the type of salt that is found in the ocean? 5. List the following in order from largest supply to smallest supply: liquid fresh water, salt water, solid fresh water.

18 Ocean Fun Fact: The Pacific Ocean is the largest and deepest ocean in the world---its deepest point is nearly 7 miles deep near the Philippines Islands. United Streaming: Planet Earth Deep Oceans---clip on Ocean Creatures -- on.com/index.cfm?guidassetid =C78FEA40-C28E-45AA-902F- 8EF3D6EB5BCD&blnFromSearc h=1&productcode=us#

19 Stop: Critical Thinking What questions may we have at this point about our water on Earth s surface? --think how or why questions!! Read pg. 376 in your textbook. Write one sentence summary for each section.

20 FYI:Why can t we drink salt water? Your body s cell Drinking salt water, causes your bodies cells to release water in an attempt to create balanced levels in your body. This loss of water from cells destroys their functionality, leading to dehydration, seizures, unconsciousness and brain damage Also, kidneys are overwhelmed with salt causing them to shut down which can kill you.

21 FYI: Making salt water drinkable: expensive and challenging, but doable VIDEOS How can we make salt water drinkable? Desalinate it! (take the salt out). The United States has the capacity to desalinate more than 1.4 billion gallons of water per day. BUT this is LESS THAN 0.01 % of water use nationwide

22 Check for Understanding: 1. Why is the ocean so salty? Where does the salt come from? Why is it all in the oceans now? 2. Why can t you drink ocean water? 3. Name the 5 oceans.

23 Drinkable Water Water that is ready to drink now. Freshwater (no salt) water from lakes, rivers, streams.

24 Freshwater Fun Facts: 1/5 of all fresh water runs from the Amazon River. Lake Superior is the largest freshwater lake larger than four states--ct, MA, NH and VT combined

25 Getting to the Fresh Water Think Pair Share: If 1% of Earth s water is usable, why can we only easily access (drink) 0.3%? Where is the 0.7% of the freshwater that makes it hard to get?

26 Most of Earth s drinkable water is either trapped underground or frozen in Ice caps. Read pg. 82 in small textbook- define the following words: surface water, glacier, and ground, water

27 Getting Ground Water: Pools of ground water build up when water from the surface seeps into the Earth. It sinks lower and lower until it hits a waterproof layer of rock. To get this water we dig wells and pump it up out of the ground.

28 ater Supply Check for Understanding How much of Earth s surface is water? How much of Earth s water is drinkable? Why can t we drink all the water? Where is saltwater found? Why is it salty? Where is freshwater found? Why can we not access all the freshwater? Approximately 99.7% of all water on Earth is found in oceans, seas, ice, and the atmosphere. Based on this information, which statement is more accurate? A. the Earth s freshwater supply is infinite B. less than 0.3% of Earth s water is drinkable C. humans are not dependent on ocean water D. the water cycle returns all usable water to the sea

29 Exit Ticket & Homework: