Which statement best describes an igneous intrusion?
a. magma explodes to the surface and forms a smooth outer layer of rock.
b. igneous intrusion for when ice crystals splash into lava.
c. magma is injected into surrounding rock forming an igneous intrusive.
d. magma is exported to an open area and forms iron.

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.