1) - Comets are big balls of rock and ice that travel in space., 2) - Comets exist in a big group called the Oort cloud, until gravity pulls them closer to the sun., 3) - The gravity of the sun pulls the comet in, and causes the ice in the comet to melt., 4) - Because there are small rocks (dust) in the ice, when it melts the rocks become part of the comet's tail.,

G6 - 3D - Order the life cycle of comet

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