weekly blog(3/9/18)Plate tectonics.

http://www.physicalgeography.net/fundamentals/10i.html

Summary

           Tectonic plates are the plates that cover the earth. The plates may feel stable, but they're in constant movement. These plates expand and contract on each other. First, when an continental plate meets an oceanic plate, the heavier oceanic plate sinks under the light continental plate and melts back into the mantle. This is subduction. Subduction creates pressure in the magma and that pressure is released in near by volcanoes. There are also many other things that can happen. When two continental crust collide it creates mountains. When two oceanic plates pull apart, it makes stuff like the Mid-Atlantic ridge.

S&EP

          To demonstrate the plate tectonics we learned, we used; frosting, fruit roll ups, and gram crackers. The frosting was representing the mantle, the fruit roll ups where the thin, dense oceanic plates, and the graham crackers were the light continental crust. We demonstrated the making of ridges by putting the fruit roll ups on the "mantle" and spreading them apart. Then we showed subduction by putting the FRU (fruit roll up) next to the graham cracker and pushing them together so that the FRU was pushed under like subduction. Then we pushed two wet graham crackers together to make a mountain. And finally earthquakes. We simulated this by having two DRY graham crackers rub against each other.

XCC

          It is cause and effect when convection currents under the crust in the mantle cause the crust plates to move. When they move all these other things happen that I told you about. Some of these (like volcanoes) cause life to grow. Now we are using geothermal energy and harming the mantle. That's a different story.