OSU OC 103 - e-OC103-Lesson12 (10 pages)

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e-OC103-Lesson12



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e-OC103-Lesson12

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Pages:
10
School:
Oregon State University
Course:
Oc 103 - Exploring The Deep: Geography Of The World's Oceans

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OC103 Lesson 12 Properties of Seawater This lesson covers the water in the ocean where it came from what s in it and how its composition affects its behavior Where did the water on Earth come from Mostly from outgassing of Earth during volcanic activity early in its history Remember how Earth differentiated early in its history and some of the heavy chemical elements such as iron and nickel sank to form the core Well for the same reason the lightest elements rose to the surface and then accumulated there to form our atmosphere and oceans This process was not complete and 90 of the water on Earth is actually still dispersed in minute concentrations deep in the crust and mantle within Earth Even though the oceans are almost 100 water they are only about 4 5 km thick deep whereas the crust and mantle mostly contain less than 1 water but are thousands of km thick In this class we will ignore the water deep inside Earth since it has little to do with oceanography So when we talk about the amount of water on Earth we are only referring to the water whether solid liquid or gas at or very near to Earth s surface not locked up deep in Earth A much smaller amount comes from comets that fall to Earth Many comets are made of rocky ice and when those comets strike Earth a common occurrence but they are usually so small that we do not notice them their ice melts and makes a small contribution to the water on Earth Over millions of years this water adds up but is still a small amount compared to what is already here on Earth Where s the Water Now Reservoir Percent Volume million km3 Oceans 97 5 1320 Ice polar 2 1 29 Groundwater 0 4 5 Lakes 0 01 0 1 Atmosphere 0 001 0 01 Rivers 0 0001 0 001 So almost all of the water on Earth is in the oceans and when you add that to how much is in the polar ice caps less than 0 5 is left for everything else All six of these reservoirs are connected by something called the Hydrologic Cycle The Hydrologic Cycle The Hydrologic Cycle is a description



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