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Init 2/17/2010 by Daniel R. Barnes WARNING: This presentation contains graphical and audio elements taken without permission from the world wide web. Do not copy or distribute this presentation. Its very existence may be illegal. CONTINENTS AND OCEANS ? Europe ? Asia Mediterranean ? Sea Africa ? North America ? Pacific ? Ocean Indian ? Ocean Australia ? ? Antarctica Atlantic ? Ocean South ? America ? Atlantic Ocean FAMOUS LOCATIONS Los Angeles West sa-eed! New York City FAMOUS LOCATIONS Norway & Sweden Italy Greenland Siberia Alaska China Japan Los Angeles Himalayas Egypt India Hawaii Philippines Iceland New York City Brazil HISTORICAL ASIDE: Countries that were at some point part of the BRITISH EMPIRE Sorry, Erlis. Turkey is grey on this map. It has never been a possession of the British. It looks like the Brits owned the island of Cyprus at some point, though. That’s close to Turkey. HISTORICAL ASIDE: Countries that, in 1683, were part of the OTTOMAN EMPIRE Grand Vizier Köprülü Fazıl Ahmed Pasha It looks like you were just thinking of the wrong empire. Topography is . . . . . . the study of the shape of the earth’s surface The sea floor has just as much topographic diversity as dry land does . . . Dry Land Mountains Valleys Plains Volcanoes Faults Plateaus Ocean Floor The deepest parts of the ocean are colored . . . . . . dark blue on this map. These deep, wide, dark, flat regions of the seafloor are called . . . abyssal plains gulper eel Is this one fake? gulper eel Mid-Atlantic Ridge divergent plate boundary seafloor spreading Basaltic eruptions make new oceanic crust pillow basalt Mid-Atlantic Ridge Oceanic ridge Mid-ocean ridge What continental are all the red shelf zones? shallow water often good for fishing Grand Banks can easily become a land bridge . . . continental shelf shallow water . . . when sea levels drop . . . . . . during a glaciation phase of an ice age can easily become a land bridge . . . . . . when sea levels drop . . . . . . during a glaciation phase of an ice age This map has a different color code than the last one. On this map, what color are the continental shelves? On this map, what color is the mid-ocean ridge? On this map, what is in dark blue? On this map, what color are the highest mountains? Volcanic eruptions can and do occur underwater . . . a LOT, in fact Lava comes out and quickly solidifies when it touches the water. Each layer of igneous rock adds size and mass to the volcano. These undersea mountains are called “seamounts”. If the magma supply from underneath doesn’t die out too soon . . . The seamount will eventually get tall enough to become an island. Islands have a tendency to become surrounded by coral reefs. Coral is an animal, even though it sits in place like a plant. However, coral polyps, which are basically jellyfish with their heads stuck to a rocky skeleton they secrete, do typically have tiny golden-brown algae living in them that photosynthesize. Therefore, coral must grow in clear, shallow, sunlit waters. If the volcanic eruptions stop, the island stops growing, but weathering and erosion don’t stop, so the island shrinks. The island itself may shrink, but the ring of coral remains, since it’s alive, and can grow, if needed, to stay high enough to reach light. The ability to fight the forces of weathering and erosion are, in fact, a sign of life. Coral is a combination of rock and living tissue, so not only is it subject to normal weathering and erosion; it is also subject to being eaten . . . The green humphead parrotfish eats algae that grows on coral, and also eats the coral itself. Because it eats coral, it poops out calcium carbonate sediment. If eruptions have stopped, waves will wear the island away until its surface lies beneath the waves, but the coral keeps growing Once the island is worn down beneath the waves, coral can grow on top of it, turning the fringing reef from a doughnut shape into a solid disc shape (cookie?). It is now an “atoll”. The oceanic crust from which the island projects often begins to sink once the magma supply dies out. The coral keeps growing upward, creating more and more calcium carbonate skeleton, to stay high enough for light. At some point, though, the crustal plate may sink so low that the coral can’t grow fast enough to stay in the light, and the reef dies. At this point, the submerged ex-island is no longer an atoll, but a guyot. Guyots are flat-topped seamounts that used to be islands. e=mc2 North Atlantic Gyre North Pacific Gyre Indian Ocean Gyre South Pacific Gyre South Atlantic Gyre North Atlantic Gyre North Pacific Gyre Indian Ocean Gyre South Pacific Gyre South Atlantic Gyre Europe Asia Africa North America Pacific Ocean Indian Ocean Australia Antarctica Atlantic Ocean South America Atlantic Ocean