Question

multiple choice

1. which of the following was not a component of earths early

atmosphere?
a) methane
b) oxygen
c) ammonia
d) carbon dioxide

1. the formation of oceans on early earth was primarily due to:

a) volcanic eruptions
b) condensation of water vapor

Explanation:

1. Early Earth's atmosphere had methane, ammonia, and carbon dioxide. Oxygen was not present as there were no photosynthetic organisms to produce it.
2. The formation of oceans on early Earth was mainly due to the condensation of water vapor. Volcanic eruptions contributed some water but condensation was the primary cause.

Answer:

1. b) Oxygen
2. b) Condensation of water vapor