What determines the size of the crack in the Earths crust? Will it ever split completely in half?
The size of the crack, where a rift starts is controlled by the types of rocks on each side, and the rate of movement of each plate on each side of it. The crack doesn’t stay a crack for long, because hot lava fills the crack, cooling almost immediately to make solid rock. The Earth won’t split completely in half, because of this new rock filling in the crack.
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