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A long long time ago, maybe about 1,000,000 years ago, the mantel which is under the earth's crust (and we're standing on the earth's crust) was just like the earth's crust. But now it is hot melted rock. Over the years the mantel gets hotter. The Mantel gets so hot that it melts through the continents and separates them even more. Answer Plate Tectonics. The earths crust is floating on the molten magma which is what the centre of the Earth is made of. There are currents in the magma which tore the original single land mass (Pangea) apart and dragged the pieces apart. The pieces, called plates, are still drifting. Sometimes they crash into each other like India and Asia.

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