What can you tell about an igneous rock that is coarse-grained?
O A. It probably formed under water.
O B. It is extrusive.
O C. It is a silicate.
O D. It is most likely intrusive.

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -