Which causes seismic waves

a: convection in the mantle

b: movements of the plates

c: gravity in the mantle

d: movements of the core

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.

answer: i dont know the answer but this might

explanation:

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