Presentation on theme: "Exploring the Ocean Since ancient times people have studied the ocean such as waters and ocean floor It provides food and services, and serves as a route."— Presentation transcript:
2Exploring the OceanSince ancient times people have studied the ocean such as waters and ocean floorIt provides food and services, and serves as a route for trade and travel
3The World’s Oceans71% of the Earth’s surface is covered by ocean water.The oceans contain 97% of the earth’s water.All the oceans and seas are actually one continuous body of water.
4OceansThe oceans are the Atlantic, Pacific, Indian. Arctic and Southern.The Pacific Ocean is the largest ocean.The area and volume of the Pacific Ocean are greater than the Atlantic and Indian combined.
5Seas A sea is a part of an ocean that is nearly surrounded by water. The Mediterranean, Arctic and Black Sea are really part of the Atlantic Ocean.
6Ocean Floor MakeupThe ocean floor has higher mountains, deeper canyons, and larger flatter plains. Earthquakes occur more often.The rocks are very different.The crust is thinner
8Edges of the Continents The shoreline is a boundary between where the land and the ocean meet.The topography of the ocean floor is different from the topography of the continents
9Continental MarginThe area where the underwater edge of a continent meets the ocean floor is called a continental margin.A continental margin consists of a continental shelf, a continental slope and a continental rise.
10Continental shelfThe flat part of a continental margin that is covered by shallow area of the ocean floor that extends outward from the edge of a continent is called a continental shelf.
11Continental shelf Depth of 130 meters and gets steeper A continental shelf slopes gently from the shoreline.The width of the continental shelf varies.Large mineral, oil and natural gas deposits are found here.
13Continental Slope The steep edge of the continental shelf At the edge of the continental shelf, the ocean floor plunges steeply 4 to 5 kilometers.A continental slope marks the boundary between the crust of the continent and the crust of the ocean floor
14Continental RiseSeparating a continental slope from the ocean floor is a continental rise.A continental rise is made of large amount of sediments, rocks, plants and animals.Sometimes the sediments are carried down the slope in masses of flowing water called turbidity currents, like an underwater avalanche.
16Abyssal PlainsLarge, flat areas on the ocean floor are called abyssal plains.The abyssal plains are larger in the Atlantic and Indian than in the Pacific due to the deposition of sediments by large rivers.The Pacific Ocean has large cracks that trap sediments and result in smaller abyssal plains.
17Abyssal PlainsAbyssal plains close to the continent are made of mud, sand and silt.Farther out on the abyssal plains, some of them contain the remains of tiny organisms that form ooze.Where ocean life is not abundant, the floor of the ocean is covered with red clay
18PlatesPieces of earths crust along with parts of the upper mantle are called plates.The plates move at an average speed of several centimeters per year-barely faster than your fingernails growThis is whatshaped the dramaticfeatures of the ocean,such as mountainsand trenches
19Seafloor SpreadingMid ocean ridge is along boundaries of plates that are moving apart or Diverging adding a new strip of rock to the ocean floorMagma squeezes up through cracksMagma hardensSeafloor spreading is what produced our ocean floorWhen plates come together or Converge, one plate sinks under the other
21Mid ocean RidgesThe mid ocean ridges form an almost continuous mountain belt that extends from the Arctic Ocean down through the middle of the Atlantic Ocean around Africa into the Indian Ocean and across the Pacific Ocean , much as the line of stitches winds around a baseball.In the Atlantic it is called the mid-Atlantic Ridge and in the Pacific, the Pacific-Antarctica Ridge.
22Formation of Mid ocean Ridges Mountain ranges on land are formed when the Earth’s crust folds and is squeezed together.Mid ocean ridges are areas where molten material from deep within the Earth flows up to the surface and cools and forms new crust.Has 2 parallel chains of mountains separated by valley and trenches
23Submarine CanyonsIn many areas, submarine canyons cut through a continental shelf and slope.They are deep, V-shaped valleys that have been cut in the rock, possibly by turbidity currents.The Monterey Submarine Canyon(2000 meters) is deeper than the Grand Canyon.
24RiftsRunning along the middle of the mid ocean ridges between the rows of parallel mountains are deep crevices or rifts.Rifts are areas of great earthquake and volcanic activity.
25TrenchesTrenches are the deepest parts of the ocean found along the edge of the ocean floor.Is a steep sided canyon in the ocean floorThe Mariana Trench in the Pacific Ocean contains the deepest spot on Earth- the Challenger Deep.
26Mariana TrenchThe Mariana Trench is 2, 542 km (1,580 miles) long (more than five times the length of the Grand Canyon) and 69 km (43 miles) wideThe Challenger Deep is 11,033 meters (36,201 feet), almost 7 milesIf Mount Everest, which is the tallest point on Earth at 8,850 meters (29,035 feet), were set in the Mariana Trench, there would still be 2,183 meters (7,166 feet or about 2 miles) of water left above it.https://www.youtube.com/watch?v=9FYKLS7xjpg