There are two changes that a substance can undergo that may either be physical changes or chemical changes (depending on the other changes that occur, too) (they show up in both categories). what are these two changes?

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the correct answer should be false

{apex}

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers