This was not a prominent gas in the Earth's early atmosphere A) ...

[aabwk4]

This was not a prominent gas in the Earth's early atmosphere
 A) methane.
  B) ammonia.
  C) hydrogen.
  D) helium.
  E) oxygen.

Question 2

This is the most fundamental reason why Earth currently has an atmosphere
 A) strong winds keep the atmosphere moving horizontally above the Earth.
  B) the Earth's magnetic field prevents gas molecules from escaping into space.
  C) the Earth's gravity is strong enough to prevent most gases from escaping into space.
  D) Earth's atmosphere is quite dense, and thus very viscous.
  E) the solar wind constantly adds gas particles to the atmosphere.

[mcni194]

Answer to Question 1

E

Answer to Question 2

C