The way in which each of the three major groups of rock forms is different. a. true b. false

That is true.

These are the three types:

Igneous- form when magma cools down and hardens.

Metamorphic- form under earth's surface after particles undergo intense heat and pressure.

Sedimentary- forms when different layers of sediment accumulate on top of each other and harden creating a solid piece.

Hope it helped!