A student observes some sugar as it is heated and bums. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar
provides evidence of a chemical reaction?

I think that's the process of melting

Explanation:

when the sugar molecules are heated, the molecules of it wil decompress

the scientific method.

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

hope it ,

bioteacher101