In the compound CaCO3 (calcium carbonate), the subscript 3 at the end of the compound represents the number of
A molecules in the compound
B. elements in the compound
C. atoms of oxygen
D. neutrons in carbon

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.