This week during science we watched a movie about how the earth was created. The movie talked about how the earth was created by two planets crashing into each other. When they crashed there was so much force that the inside of the new planet melted and turned to magma ans lava. So now when never there plates shift and cracks appear, magma comes through and seals the cracks until they drift agan. When this happens over and over again, new land is created. When one plate gets stuck under another plate, the one underneath melts into magma. That way land is always being created and land is always being melted back down. With this system there will never be to much land or to little. We also learned about the layers in the earth. There is the crust, mantle, outer core, and inner core.The inner core is the hottest place and the crust is the coolest place. When two plates drift apart the magma comes from the inner core and surges upward toward the crust and fills in the place where the plates drifted apart.

We also learned about how the continents drfted apart. At the begining when there was one big super continent the Sahara Desert was ten times bigger then the one in America now. Mountains were at the ede of the continent and clouds got stuck on the ocean side. On the inside of the continent the water dried up and because there were no clouds, it couldn't rain. It got really dry and a desert formed. When the continent drifted apart the desert broke up. That's why there are a lot of the same fossils on different continents.