The abyssal plains are made of basalt escaping from large underwater fissures in the earth's crust. As the molten rock is expelled from these fissures, it spreads out and cools, forming vast areas of relatively flat topography.
Continue reading this answer and u might find out how a prairie is made.... and you might find out who i am. i am in yr 7 and i am in science in the library researching how landforms are made. i dont...
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