Contact metamorphic occurs when ? 1. Plate boundaries collide
2. Magma comes into contact with rocks
3. sediment come into contact with rocks
4. Minerals crystals rearrange into a wavy layer

It is number two.

Explanation: I would write a paragraph explaining why its two but last time I did that somebody commented a simple one sentence thing that was ranked brainliest because it was posted before me even though I wrote a entire paragraph. So there you go.

explanation:

7 - to develop an asian ally

11- the red scare

14   the power of military -industrial complex

17 - the economy grew quickly

24 - the separation of church and state was not important