What is the least property to identify quartz
a: color
b cleavage/fracture
c: hardness
d: streak

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.

Which soil layers comprise the topsoil? o horizon a horizon b horizon c horizon

What does the map above tell us about the endemity of typhoid fever