Scientists digging in a cave found an unknown substance. The scientists found that the substance’s molecules were moving around each other. The scientists increased the speed of the substance’s molecules and caused a phase change. How did the scientists do this, and how did this affect the substance?

The scientists transferred energy . . .

a
into the substance, and the substance changed into a gas.

b
into the substance, and the substance changed into a liquid.

c
out of the substance, and the substance changed into a solid.

d
out of the substance, and the substance changed into a liquid.