OSU OC 103 - e-OC103-Lesson04-bw (1) (9 pages)

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e-OC103-Lesson04-bw (1)

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Pages:
9
School:
Oregon State University
Course:
Oc 103 - Exploring The Deep: Geography Of The World's Oceans

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OC103 Lesson 4 Earth s Structure The Interior of Earth To understand why the oceans are where they are and even why we have oceans at all we must start with the fundamental structure of Earth Earth is like an egg with concentric layers of the following Crust hard outside layer fairly thin compared to the rest like the shell on an egg Mantle solid middle layer Core deep inside includes a liquid outer core and a solid inner core So it looks something like this The Shape and Depths of the Oceans This layered structure and the different properties of each layer explains the origins of some of the important features we see at the surface such as continents ocean basins mountain ranges both on land and in the oceans island chains and volcanoes The map below shows the surface of Earth with the water removed from the oceans The different colors in the oceans represent depths from orange shallowest 200 m deep to yellow to green to blue to purple deepest 6000 m deep Notice that most of the ocean floor is very deep 4000 m deep shown in light blue to purple and that there is not much orange and yellow compared to how much blue there is The shallowest orange areas are restricted to narrow bands around the continents and the somewhat shallow yellow areas are mostly along some narrow mountain ranges out in the oceans Why is so much of the oceans so deep And why is so little of it shallow And why is it either deep or shallow with so little in between notice how little of the map is green To answer these fundamental questions about the nature of the ocean floor we need to back up and discuss what Earth is made of because that determines the shape of its surface and thus the shape and depth of the oceans The next few Lessons will describe the interior and exterior of Earth and discuss how geologic forces shaped the exterior to make the map below look the way it does How do we determine what s inside Earth Could we let Hollywood show us and watch Journey to the Center of the Earth or



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