Crossword Clue:

the study of rocks

Answer	Crossword Clue
MOSSY	Like the north side of some rocks
ANN	One of the Wilson sisters of rock's Heart
IDAHO	Home of the City of Rocks National Reserve

SCREE	Patch of loose rocks at the base of a cliff
GREENALGAE	Growth on wet rocks or the surface of stagnant water
KARENO	Lead singer of rock's Yeah Yeah Yeahs (who uses just the initial of her last name)