The very first Earth atmosphere,forming with Earth itself,was probably dominated by the cosmically abundant gases ________ and ________.
A)nitrogen;oxygen
B)hydrogen;helium
C)carbon dioxide;methane
D)water vapor;sulfur dioxide

Question

Quizplus · Accepted Answer

The very first Earth atmosphere, formed with Earth itself, was probably dominated by the cosmically abundant gases hydrogen and helium. This is because these gases were the most available at the time and were likely brought to Earth by the planetesimals that collided with it during its formation. Over time, however, these gases were lost to space, and the Earth's atmosphere was replenished by volcanic outgassing and other processes, eventually leading to the development of an atmosphere that was rich in nitrogen, oxygen, carbon dioxide, and other gases.

The Very First Earth Atmosphere,forming with Earth Itself,was Probably Dominated