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Ocean Water Chapter 15.

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Presentation on theme: "Ocean Water Chapter 15."— Presentation transcript:

1 Ocean Water Chapter 15

2 Section 1 Properties of Ocean Water
Objectives: List substances that are dissolved in ocean water Explain how a thermocline forms Compare and Contrast properties of ocean water Predict the solubility of salt in water at different temperatures

3 Skills Warm-up What’s in Water?
Suppose that you have a glass of pure water, a glass of fresh water, and a glass of salt water. If you evaporated the water, what would be left behind in each glass?

4 Origin of Ocean Water When earth first formed, it was very ________
Active volcanoes sent ________ ________and ___________ out One of the gasses was _________________ The released gasses gathered in a layer to become the __________________

5 Origin of Ocean Water After earth’s surface cooled, the water vapor ________________ into droplets of water Water droplets combined and fell to earth as _________ Rainwater flowed over earth’s surface and formed _________ and __________ Water then pooled in large connected basins – the _____________

6 Our Oceans 4 Oceans Pacific Ocean – largest ocean ___________
covers ______ of the earth contains _______ of earth’s salt water

7 Chemical Properties of Ocean Water
Ocean water is a mixture of dissolved __________ tiny amounts of many __________ As rivers flow across earth, these substances are picked up When rivers reach the ocean, the substances are deposited as _________ ______ or used by _______ _____________

8 Chemical Properties of Ocean Water
Major dissolved gasses ________ ________ ____________ Major dissolved salts

9 Salinity The number of _______ __ ______ in 1 kg of water
Average salinity of ocean water is _________ Salinity varies from one part of the ocean to another What causes high salinity: High _______________ Low _______________ ________________ What causes low salinity: Melting ____________ Where fresh water meets salt water (___________)

10 Parts of salt per 1000 parts ocean water

11 Physical Properties of Ocean Water
_______________ Top of water column directly heated by ______ – depth of 100 to 400 meters Summer surface temps are _________ than winter Temp varies from place to place – water is warmer near the __________ and cooler near the __________

12 Physical Properties of Ocean Water
Just beneath the surface water is a zone where water temp decreases rapidly - ______________ Thermocline forms because warm surface water ______ __ ____ ___ colder water Depth of thermocline changes with the __________ and with ___________ Below the thermocline, water temp decreases only _____________


14 Ocean Water and Living Things
Organisms that live in the ocean use substances dissolved in ocean water to survive _________ – use dissolved nitrate for growth _____ __________– use calcium to build tough, thick shells _________ – use silica to build tiny, intricate shells

15 Ocean Water and Living Things
Many organisms depend on __________ For what???? Sunlight can’t _______________ too far into ocean water These organisms must live in _______ ________ near the shore or _________ on top of the water Examples – algae and diatoms

16 Ocean Water and Living Things
Some organisms move up and down in the water column by changing their ________ Fish have a _________ ____________ Fill with gas from bloodstream – fish is less dense – fish rises Empty swim bladder – fish is more dense – fish sinks deeper Organisms that live in deep ocean water must withstand great _____________

17 Drinkable Ocean Water You shouldn’t drink ocean water – it has too much _________ for your body to process You will actually get more ___________! Some areas of the world don’t have enough fresh water They drink ocean water by removing the salt - ________________

18 Desalination Ocean water is pumped into a chamber and __________
Water turns to __________ Steam is sent to another chamber where it cools and _____________ Salt is too __________ and is left behind Water from condensed steam is fresh and ________________ But fossil fuels need to be used to heat the water

19 Check and Explain 1. What substances are dissolved in ocean water?
2. What is a thermocline? Explain how it forms. 3. Explain the following properties of ocean water: composition, temperature, salinity, and density. 4. Imagine you have a glass of water at room temperature. You mix salt into the water until no more will dissolve. Then you put the glass in the refrigerator. What will happen to the salt in the water?


21 Lab – “How Do Temperature and Salinity Affect Density?”
Text page 344


23 Section 2 Ocean Currents
Objectives: Describe the major ocean current patterns in the Pacific and Atlantic oceans Identify two factors that drive ocean currents Compare and Contrast surface currents and deep currents Predict the effects of the Coriolis force

24 Skills Warm-up At the Edge
Imagine that you are riding in the center of a merry-go-round. You want to throw a ball to a friend at the edge of the merry-go-round. Where would your friend have to sit to be able to catch the ball?


26 Ocean Currents If you were on a boat adrift in the ocean near Antarctica, the boat would travel in a _____________ direction. It would be carried along in a flow of water called a ____________ Current – a flow of water moving through the ocean A strong current flows in a clockwise direction around _____________

27 Ocean Currents Currents flow through all parts of the ocean
_______ __________ – flow horizontally at or near the top of the ocean _______ __________ – flow horizontally far beneath the surface Ocean water also flows _____________ Ocean water can flow down toward the ocean floor or up toward the surface

28 Surface Currents Surface currents are driven by _______ that blow for long distances over the ocean’s surface The winds blow in a ________ ______ because of the Coriolis effect __________ __________ – caused by the earth’s rotation, bends the earth’s winds and ocean currents


30 Ocean currents movie

31 Surface Currents and Wind Patterns
Earth rotates in an ___________ direction Earth’s motion makes winds blowing toward the equator curve ____________ Winds blowing toward the poles curve ____________ Surface currents in the ocean form similar patterns If winds change direction, so do surface currents

32 Surface Currents in the World Ocean
________ currents flow from the equator ________ currents flow from the poles Surface currents form a circular pattern called a ________ Gyres in the northern hemisphere flow ________________ Gyres in the southern hemisphere flow ________________

33 Deep Currents The movement of surface currents has little effect on _______ ________ __________ Deep currents are kept in motion by __________ differences Cold water is the most dense and is at the ____________ This deep cold water flows toward the ___________, but the Coriolis effect bends them ______________

34 Deep Currents Where winds blow in a constant direction parallel to the coast, surface currents and deep currents can mix Wind pushes warm surface water _______ _____ ____ ________ ______ _______ _________ moves up to take its place _____________– the upward movement of deep water Upwelling brings ___________ up from the ocean floor – attracts marine animals


36 Shoreline Currents Near shoreline, _______ currents form that travel only __________ ______________ ____________ _________ – when waves approach the shore at an angle and create a zigzag pattern parallel to shore

37 Shoreline Currents If there is a __________ or ___________, longshore currents can be trapped Once it finds an opening, the longshore current breaks out forcefully A narrow, powerful stream of water flows at a right angle to the shore – ______ __________ Very _______________ – swim parallel to shore

38 Shoreline Currents ____________ – forms when water carried to the shore in waves pulls __________ toward the ocean Usually it is not strong enough to be dangerous But, if wave action is _________ or ocean bottom _______ _________ sharply, it can pull swimmers out to deeper water

39 Upwelling and Fisheries
In areas of ___________, winds blow warm surface water away from the coast Cold, deep water moves in to fill the space This cold, deep water contains large amounts of _____________ that support _________ and feed _________ These are the areas of the world’s most __________ fishing grounds


41 Upwelling and Fisheries
Usually the upwelling area along the ________ coast of S. A. is very productive But, when ____ _________ comes, upwelling stops El Nino is a disturbance of ocean currents and winds that occurs every _______ _______ It warms coastal waters, not allowing the nutrient rich colder waters up No nutrients – no fish!


43 Check and Explain 1. Describe the surface currents in the North Pacific Ocean and the North Atlantic Ocean. 2. What two factors cause ocean currents to form? 3. How do surface currents and deep currents differ? How are they similar? 4. What direction would a plane have to travel to reach a city directly south of its starting point if winds were blowing to the east? Why?


45 Section 3 Ocean Waves Objectives: Explain how waves form
Identify the parts of an ocean wave Explain how to measure wave motion Define how a water particle moves as a wave passes

46 Waves Ocean waves form when _________ pushes against the ocean’s surface _________ from the wind pushing makes ripples form __________ is transferred from the wind to the water, making a wave The _________ a wave surface becomes, the more energy it can absorb from the wind


48 Mechanics of Wave Motion
When you watch a wave move, the water appears to _______ __________ But, the water barely moves at all It is ______ ___________ that moves forward, not the water particles Water particles actually move in a circular __________________ motion

49 Characteristics of Waves
Ocean waves form _____ _______ ________ Wind blows over open water causing unevenly space, ragged ______ ___ _________ to form As the wave energy continues to travel, the waves form an even series of smooth, low hills of water called ____________


51 Wave Action and Energy As a wave gets closer to shore, its height __________ and its wavelength ____________ As wave reaches shallow water some of the wave energy transfers up increasing ______ _________ When wave contacts the ocean floor, friction slows down the deeper part of wave but wave crest keeps moving and ________ _________

52 Wave Action and Energy Waves carry a large amount of _________
When a wave breaks all the energy is ___________ against the shore Can destroy property and disrupt boating and shipping Can build a ___________ – high, sloping wall built at an angle to the shore This forces waves to break away from the shore and it is protected from the full force of the waves


54 Earthquakes and Ocean Waves
The most dramatic and destructive ocean waves are caused by _______________ Earthquake causes part of the ocean floor to ______ ______ This pushes overlying water up, forming a ________ of water As bulge settles down, it creates a series of _______ ___________ These ___________ waves can travel at speeds of over 700km/hour


56 Rogue Waves June 3, 1984 the Marques sailing ship was sunk - 19 of its 28 crew members were lost The cause was a _______ ________ that seemed to come out of nowhere Rogue waves occur when two ordinary waves ___________ If their crests and troughs line up, their energy is added together and can form a wave up to ___ _________ __________

57 Check and Explain 1. How do ocean waves form?
2. Name the parts of an ocean wave. 3. Imagine you are on the deck of a boat on a calm day. How can you determine the period of the waves passing under the boat? 4. Imagine a small piece of driftwood floating in the ocean. Describe its motion as a wave passes under it. What does this tell you about how a water particle moves as a wave passes?


59 Activity Tsunami move


61 Section 4 Tides Objectives:
Describe the effect of gravity on earth’s water Explain why tides change Compare and Contrast the different types of daily tide patterns Predict the effects of tides on fishing

62 Gravity and Ocean Water
The sun and moon are large objects that exert __________ _______ on the earth _________ _________ shows the effects of gravity more than the solid earth Every day the level of the ocean surface rises and falls because of the gravitational pull of the sun and the moon ________ – the daily changes in water level

63 Gravity and Ocean Water
Gravitational pull of the moon on the ocean is ________ on the side of earth _______ the moon This causes the ocean to bulge on that side On the side of earth ________ the moon, the moon’s gravity pulls the _____ ______ towards it and away from its ocean This also causes a bulge

64 Gravity and Ocean Water
As the earth rotates, _____ _______ occur in areas of the earth’s surface beneath the bulges ______ _______– the highest level that ocean water reaches on the shore Low tides occur in areas between the bulges _____ ________– the lowest level that ocean water reaches on the shore

65 Daily Tide Patterns Every _______ ______ has at least one high tide and one low tide every day Factors that influence daily tide patterns ________________________________________________ ________________________ Tide patterns repeat every 24 hours and 50 minutes Because a complete cycle takes slightly ______ than a day, tides occur at different times

66 Daily Tide Patterns _____________________– two high tides and two low tides each day Atlantic coast of U.S. _____________________ – one high tide and one low tide each day Southeastern U.S. along Gulf of Mexico ______________________– mix of diurnal and semidiurnal tide patterns Pacific coast of U.S.

67 Monthly Tide Cycles Tide heights can vary each month
______________– daily tides cycles with the greatest difference between high and low tides ______________ – daily tides cycles with the least difference between high and low tides Periods of spring and neap tides occur twice each month and are caused by the changing positions of the sun and moon

68 Tides and Living Things
Some organisms live on the shore __________ the level of the highest tide and the lowest tide – must ___________ Sand dollars Hermit crabs Seaweed As tide changes, they may be _________ with water or __________ to air and sun Fish are also affected by tides and may come _________ to shore to feed during high tide

69 Grunion Life cycle of the grunion fish depends on _______ __________
They swim onto the beach to _________ during the highest spring tides They ________ their eggs in the sand, where they will develop until the next spring tide The rising water stimulates the eggs to ________ and the young grunion swim out to sea

70 Tidal Power – Provides Energy
Power plant at mouth of ________ ________ in France Huge _______ was built across the river with _________ beneath the surface for water to flow through Inside the tunnels are large spinning _________ Spinning turbines operate _____________ that produce electricity

71 Check and Explain 1. How does gravity cause tides?
2. Why do tides change over the course of a month? 3. What is the difference between a semidiurnal tide pattern and a diurnal tide pattern? 4. When would a person going fishing on a beach have the best chance of catching a fish? Explain your answer.


73 Test Review Read Chapter 14 review – page 335 and complete:
Check Your Vocabulary Check Your Knowledge


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