Author Question: Methane A) concentrations in Earth's atmosphere are not increasing. B) is a poisonous gas. C) ... (Read 107 times)

ec501234 · **on:** Jul 13, 2018

Methane
A) concentrations in Earth's atmosphere are not increasing.
B) is a poisonous gas.
C) is less abundant in Earth's atmosphere than CFCs.
D) concentrations in Earth's atmosphere have nearly doubled since 1840.
E) is more abundant in Earth's atmosphere than carbon dioxide.

Question 2

Water vapor is
A) a collection of tiny liquid particles.
B) an invisible gas.
C) sometimes a liquid and sometimes a gas.
D) considered an aerosol.
E) seldom present below the base of the lowest layer of cloud.