Which terms are usually associated with sedimentary rocks? Choose more than one answer. Volcanoes
Erosion
Molten
Underwater
Layers
Coal
Plates

Ithink that the answer is b

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

Ithink ahopefully im correct