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Chapter Menu Lesson 1: Earth’s Oceans Lesson 2: Ocean Currents Lesson 3: The Ocean Shore Lesson 4: Living on the California Coast Click on a hyperlink to view the corresponding lesson. 10.1 Earth’s Oceans sea level ocean floor bathymetric map echo sounding continental shelf 10.1 Earth’s Oceans Mapping Earth’s Oceans • Five major oceans: the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, the Arctic Ocean, and the Southern Ocean 10.1 Earth’s Oceans Mapping Earth’s Oceans (cont.) • Pacific Ocean: largest ocean but decreasing because surrounded by subduction zones • Atlantic Ocean: second largest ocean, is growing larger because of new ocean floor • Indian Ocean: shallowest ocean • Arctic Ocean: covered in ice • Southern Ocean: surrounds Antarctica and connects the Pacific, Indian, and Atlantic Oceans 10.1 Earth’s Oceans Bathymetric Maps • A map showing the contours of the ocean floor and its geologic features 10.1 Earth’s Oceans Echo Sounding • Water depth can be determined using sound waves. – If the return time is short, the water is shallow. – If the return time is long, the water is deep. 10.1 Earth’s Oceans Ocean Floor • Scientists use sound waves to make cross sections of the ocean floor called a bathymetric profile. • Identifies continental shelves, continental slopes and rises, mid-ocean ridges, trenches, abyssal plains, islands, and submarine canyons Ocean Floor 10.1 Earth’s Oceans Continental Shelf • An underwater portion of continental crust that extends from the continental shoreline and gently slopes towards the deeper parts of the ocean • Continental slope: steep slope between the continent and the deep ocean, contains deep canyons • Continental rise: deposits formed between the continental slope and ocean floor 10.1 Earth’s Oceans Abyssal Plain and Trenches • Abyssal plain: an extremely flat plain on ocean crust covered with thick layers of sediment • Trenches: extremely deep underwater valleys that are subduction zones 10.1 Earth’s Oceans Mid-Ocean Ridges • A continuous chain of underwater volcanoes more than 65,000 km long • Where tectonic plates are moving away from each other and new ocean floor is created 10.1 Earth’s Oceans What kind of map is shows the bottom of the ocean, its contours, and geologic features? A contour B topographic C bathymetric D relief 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. 10.1 Earth’s Oceans What are the sediment deposits between the continental slope and ocean floor called? A continental rise B abyssal plain C trenches D mid-ocean ridge 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. 10.1 Earth’s Oceans Which is the shallowest ocean? A Pacific B Atlantic C Arctic D Indian 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. 10.2 Ocean Currents ocean current salinity gyre 10.2 Ocean Currents Ocean Currents • Transport water, heat, nutrients, animals, and plants from place to place in the oceans Ocean Currents 10.2 Ocean Currents Important Property of Water • A large amount of heat can be added to or removed from water before it changes temperature. • It takes five times more heat to change the temperature of an area of water than it does to change the same area of sand. 10.2 Ocean Currents Heat Transfer by Oceans • Amount of energy received from the Sun varies depending on latitude – Gained between 30ºN and 30ºS and at the equator – Lost at latitudes above 40º – Amount of ice in polar regions remains same – Ocean currents carry heat from the tropics to the poles 10.2 Ocean Currents Winds and the Oceans • Winds are most important force driving the movement of surface water in the ocean • Have strongest effect on the location and movement of the global ocean surface currents 10.2 Ocean Currents Coriolis Effect and the Oceans • The spinning of Earth causes currents to move in a clockwise direction in the northern hemisphere and counter-clockwise in the southern hemisphere. 10.2 Ocean Currents Density and Deep Ocean Currents • Density of water depends on its temperature and its salt content. • Salinity is the amount of salt dissolved in water. • Different parts of the ocean have different densities and form deep ocean currents. 10.2 Ocean Currents Density and Deep Ocean Currents (cont.) 10.2 Ocean Currents Gyre • A cycle of currents 10.2 Ocean Currents Special Currents • Strongest and deepest currents are on the western sides of gyres. • Redistribute heat throughout the oceans • The Gulf Stream: biggest of these western boundary currents and is part of the North Atlantic Gyre 10.2 Ocean Currents Antarctic Circumpolar Current • A continuous flow of water that surrounds land rather than water • Largest current • Connects the Pacific, Atlantic, and Indian Oceans 10.2 Ocean Currents El Niño • Warm water from the western side of the Pacific sloshes back across the ocean due to weakened trade winds • Effects are worldwide and include: droughts, increased rainfall, landslides, avalanches, and flooding 10.2 Ocean Currents La Niña • Strong trade winds pull warm tropical water across the Pacific toward Australia • South American coast becomes unusually cold and chilly 10.2 Ocean Currents What is a cycle of currents called? A gyre B salinity C Coriolis effect D echo sounding 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. 10.2 Ocean Currents D C Why do beaches get hot while the ocean stays cool when the sun is shining? A It takes 5 times more heat to change the temperature of an area of sand than it does the same area of water. B It takes 5 times more heat to change the temperature of an area of water than it does the same area of sand. C The ocean has a high salinity. 0% 0% 0% 0% D The ocean has a low salinity. B A B C D A 1. 2. 3. 4. 10.2 Ocean Currents As the salinity of ocean water increases, what also increases? A temperature B speed C density D area 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. 10.3 The Ocean Shore shore shoreline longshore current longshore drift rip current sand 10.3 The Ocean Shore Shoreline Processes • The shore is the area of land found between the lowest water level at low tide and highest area of land that is affected by storm waves. • A shoreline is the place where the ocean meets the land. • Tides are the alternate rising and falling of the surface level of the ocean. How are tides affected by phases of the moon? 10.3 The Ocean Shore Shoreline Processes (cont.) • Beaches are areas in which sediment is deposited along the shore. 10.3 The Ocean Shore Effects of Wind and Waves • Wind and waves erode larger rocks down into smaller pieces. • Shoreline erosion depends on the type of rock and the intensity of the wind and waves. • Sea arches are tunnels carved out of rock by wind and wave erosion. • Sea stacks form when a sea arch collapses and one side becomes separated from the main land formation. 10.3 The Ocean Shore Effects of Wind and Waves (cont.) • Deposition occurs when the energy of the waves is low. • A baymouth bar is an accumulation of sediment that completely crosses the opening of a bay. • A tombolo is a ridge of sediment that connects an island to the mainland or another island. 10.3 The Ocean Shore Longshore Current and Drift • The energy driving a narrow current parallel to the shore is called the longshore current. • The combination of the movement of sand by breaking waves and movement of sand by the longshore current is called longshore drift. 10.3 The Ocean Shore Rip Currents • Swift currents that flow away from the beach 10.3 The Ocean Shore Human Activity and Beaches • Artificial structures like jetties, groins, and breakwaters stop the normal flow of sand, causing beaches down the shoreline to become smaller. • Seawalls also cause erosion when the energy that is deflected by the seawall is redirected on either side or below it. 10.3 The Ocean Shore Sand • Describes rocks that are between 0.0625mm and 2mm. • Categorized as very coarse, coarse, medium, fine, and very fine. 10.3 The Ocean Shore Sand Composition • White sand: quartz or calcium carbonate from ground-up shells and coral skeletons • Black sand: basalt, mica, or magnetite • Green sand: olivine or feldspar • Red sand: coral or from iron in volcanic cinders 10.3 The Ocean Shore Sand Deposition • Sand is continuously eroded, transported, and deposited along the shoreline • Sorted according to size • Smaller grains end up on low-energy beaches • Larger grains remain on high-energy beaches 10.3 The Ocean Shore Sand Deposition (cont.) 10.3 The Ocean Shore Sand Deposition (cont.) 10.3 The Ocean Shore If sand is green in color it might originate from which type of mineral? A magnetite B olivine C mica D balsalt 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. 10.3 The Ocean Shore Smaller grains of sand can be found on which type of beach? A low energy beach B high energy beach C beach containing a jetty 0% 0% 0% D 0% C D beach containing a seawall B A B C D A 1. 2. 3. 4. 10.3 The Ocean Shore What name is given to swift currents that flow away from the beach? A longshore currents B longshore drifts C surface currents D rip currents 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. 10.4 Living on the California Coast California Current Davidson Current habitat marine 10.4 Living on the California Coast Geology of California Coast • Based on the movement of tectonic plates • As a result of tectonic activity, coastal mountain ranges stretch along the entire state of California. 10.4 Living on the California Coast Rocky Beaches • A few islands in the waters off the California coast absorb high-energy waves. • These waves erode the cliffs along the shoreline, leaving large boulders and cobbles. 10.4 Living on the California Coast Tsunamis • Large sea waves caused by the displacement of a large amount of water – Triggered by landslides, icebergs falling off glaciers, volcanic explosions, and undersea earthquakes – Sudden rise or drop in sea level is a warning sign of a tsunami 10.4 Living on the California Coast Currents Along the Coast • The California Current is a wide, slow-moving current that travels southward, bringing cool water down from northern latitudes. • The Davidson Current is a narrow, warm water current that flows north from the tropics and is stronger in winter than summer. 10.4 Living on the California Coast Currents Along the Coast (cont.) • The two currents collide near Point Conception, just north of Los Angeles. 10.4 Living on the California Coast Hurricanes in California • Hurricanes are fueled by warm water in tropical areas. • The cold water brought by the California Current acts as a hurricane shield. 10.4 Living on the California Coast Sea Life • The place in which an organism lives is called its habitat. • Sea life depends on the types of food available, the shelter, the moisture, and the temperature ranges needed for survival. • In areas where warm and cold water collide, the ocean is usually full of life. 10.4 Living on the California Coast Shore Life • The intertidal zone is the area of shore between the lowest low-tide line and the highest high-tide line. • The amount of water, exposure to air and sun varies in the intertidal zone. 10.4 Living on the California Coast Humans and the Coast • Fishing in the waters of the Pacific Ocean is a big industry. • Laws determine the number of organisms that can be removed, the time of year they can be removed, and the sizes of the organisms that are removed. 10.4 Living on the California Coast Habitat Depletion • Wetlands and other coastal marsh areas are habitats for birds, fish, insects, plants, and marine invertebrates. • Development leads to habitat and population reduction of native species. 10.4 Living on the California Coast Which current brings cool water from the north to California? A California Current B Davidson Current C Point Conception Current D Los Angeles Current 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. Lesson 4 Review 10.4 Living on the California Coast A. A Why are there no hurricanes in B. B California? A hurricanes do not form C. C in the Pacific Ocean D. D B hurricanes move east to west C water off the coast of California is cold 0% D 0% C 0% B 0% A D water off the coast of California is warm 10.4 Living on the California Coast A large destructive wave of water is called a _____. A tsunami B surface current C riptide D longshore current 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. Chapter Resources Menu Chapter Assessment California Standards Practice Image Bank Science Online Interactive Table Virtual Lab BrainPOP Click on a hyperlink to view the corresponding feature. What is formed when a sea arch collapses and one side becomes separated from the main land formation? A baymouth bar B tombolo C gyre 0% 0% 0% D 0% C D sea stack B A B C D A 1. 2. 3. 4. How can seawalls cause beach erosion? A energy is redirected on either side or below it B depositing extra sand along the length of shoreline C creating floods that hug the shoreline and eat away at the beach 0% 0% D D eroding away the cliffs along the shoreline 0% C 0% B A B C D A 1. 2. 3. 4. Sand spans what size range? A 0.020 mm – 0.063 mm B 0.063 mm – 2.0 mm C 2.0 mm – 5.0 mm D <0.020 mm 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. Why do scientists use echo soundings? A measure hurricane frequency B measure tsunami frequency C measure the depth of the ocean 0% 0% D 0% C D measure ocean currents 0% B A B C D A 1. 2. 3. 4. In the northern hemisphere, the Coriolis effect causes ocean currents to flow in what way? A west-east B south-north C counter-clockwise D clockwise 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. SCI 1.e Why is the Pacific Ocean getting smaller? A increase of glacier formation B lava continually rising the surface C subduction zones surround the ocean 0% 0% D 0% C D formation of mid-ocean ridges 0% B A B C D A 1. 2. 3. 4. SCI 4.d 0% D C Which of the following statement is true? A Currents on the western side of gyres are important to the redistribution of heat throughout the oceans. B Ocean water gets less salty when ocean water around it freezes and forms ice. C It takes 5 times more heat to change the temperature of 0% 0% 0% an area of sand than it does that same area of water. D As the salinity of ocean water increases, its density decreases. B A B C D A 1. 2. 3. 4. SCI 2.c What is a ridge of sediment that connects an island to the mainland or another island called? A playas B baymouth C gyre D tombolo 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. SCI 2.a How is a longshore current described? A narrow current parallel to the shore B swift current that flows away from the beach C water breaking through surf and rushing back to sea 0% 0% 0% D 0% C D current that flows from the north bringing cold water B A B C D A 1. 2. 3. 4. SCI 7.f What type of reference material show a cross section of the ocean floor? A topographic map B bathymetric profile C bathymetric map D echo sounding 0% 0% D 0% C 0% B A B C D A 1. 2. 3. 4. Image Bank Image Bank Interactive Table Interactive Table