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Transcript
Position of the continents Mrs. Snyder 4th grade science Changes • Watch the change in the position of the continents. • What is causing these massive Look at your map of the pieces of the world. Focus on the Earth’s crust borders of the continents. to move? The Earth: A jigsaw puzzle • Notice how the pieces of this puzzle fit together • Look at your map of the world again, which continents seem as if they fit together well? Watch the movement happening under the crust • Yellow = very hot rock moving from toward the Earth’s crust • Blue = cool sections of the crust and upper mantle sinking down toward the center of the Earth Conveyor Belts Think about the way a conveyor belt moves groceries. This is a useful analogy to describe the way the crust moves on top of the mantle. Moving continents • Watch this animation, and this one. • Think about how a “conveyor belt” driven by convection could move the Earth’s plates and change positions of the continents. • Watch this video (You Tube) to see the way plates collide. • What process results in one moving beneath the other?