The borders, or cracks, between tectonic plates are called:

Faults is the answer. Hope this helps

Geological Faults

Explanation:

It depends.

If they are pulling apart, and creating new crust - as they are in the N. Atlantic Ocean - it’s a divergent boundary.

If they are coming together and one is diving under the other -as they are on the U.S. west coast - that is a convergent boundary.

the first one is d and the second a

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