The outer core is molten metal which means: A. The metal is melted or in liquid form

B. The metal is cold and in solid form

C. The metal is frozen solid and can’t be measured

D. The metal is divided

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.