What is a sinkhole? a. a low area or hole in the ground b. a rapid slide of mud down a hill c. a large overflow of water from a river d. a mass of snow racing down a mountain

A low area or hole in the ground

The correct answer is A

Explanation:

the plates spread at mid-ocean ridges (they are divergent plate boundaries) which allows magma to rise through the weakness between the plates. the magma then emerges as lava from the boundary and cools, creating a new crust.

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