Seismologists predict that this geological feature will be the site of massive earthquakes in north america. a. san andreas fault, b. wasatch fault, c. cocos plate, d. aleutian trench

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.