2.8 kg is equal to
a) 2.8*10^6 dg
b)2.8*10^6 mg
c)2.8*10^-6 mg
d)2.8*10^6 g

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.