19

Which gas is the most abundant greenhouse gas?

A.

ozone

B.

chlorofluorocarbon

C.

carbon dioxide

OD.

methane

E.

water vapor

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Thick fuild in sinuses

A piece of electronic equipment that is surrounded by packing material is dropped so that it hits the ground with a speed of 6.5 m/s.

What causes interstellar dust and gas to start to contract and form a protostar? 1) the shockwave from a supernova 2) nearby black hole 3) an increase in the solar wind 4) nuclear fusion

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