What combination of processes can transform a metamorphic rock to sediment?
a. erosion, crystallization, melting
b. heating, pressure, lithificaiton
c. melting, crystallization, compaction
d. exposure, weathering, erosion

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes.b. it burns more cleanly than crude oil products.c. scientists have developed new ways of extracting it.d. during its extraction, groundwater can be contaminated.

The largest employer of cartographers is the