John finds a rock that contains large, light-colored mineral crystals. the rock shows no sign of being altered by heat or pressure. what can john infer about the rock?
a. the rock is formed below earths surface.
b. the rock formed from hardened magma.
c. the rock underwent lithification.
d. the rock underwent metamorphism.

Coarse grained Igneous rock are slowly cool down. The rock that John found is formed from hardened magma.

Coarse grained Igneous rock:

It is a type of igneous rock that have slowly cool down, hence minerals got more time to enlarge.

Here, John found the rock that contain large crystals without any sign of alteration due to heat or pressure.

Therefore, the rock that John found is formed from hardened magma.

To know more about metamorphism.

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From the above statement, John can infer that the rock underwent metamorphism and also is not altered by heat or pressure.

Explanation:

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.