What happens when sunlight is passed through a prism? We can see UV rays.
We can see infrared rays.
Visible light separates into different colors.
Visible light splits to form the electromagnetic spectrum.

Explanation:

I think its

Visible light separates into different colors.

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all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

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bioteacher101