Question

1. what is an effect of two tectonic plates get together?

pressure builds up.
the plates have rough edges.
the plates move slightly.

Explanation:

When two tectonic plates get together, they can't move freely. This causes stress to accumulate between them. Over time, this stress builds up. Rough edges of plates are a characteristic of the plates themselves, not an effect of them getting together. And plates moving slightly is more related to their normal slow movement rather than a direct effect of just getting together.

Answer:

Pressure builds up.