Earth's second atmosphere formed from ________.
A) leftover gases from the nebula
B) the Sun's solar wind
C) outgassing
D) comet vaporization
Question 2
When compared to coastal regions, solar energy extends ________ into the water column and concentrations of nutrients are ________ in the open ocean.
A) deeper; greater
B) deeper; lower
C) less; greater
D) less; lower