ch 1 Questions with complete solution
1. Earth's first atmosphere (approximately 4.6 billion years ago) was most
likely composed of ____.
a. nitrogen and oxygen
b. hydrogen and helium
c. carbon dioxide and nitrogen
d. oxygen and carbon dioxide - correct answer ✔b. hydrogen and helium
The primary source of water vapor and carbon dioxide for Earth's early
atmosphere was most likely ____.
a. photosynthesis
b. ozone reactions
c. outgassing
d. nitrogen chemical reactions - correct answer ✔c. outgassing
The most abundant gases in Earth's present day atmosphere (by volume) are
____.
a. carbon dioxide and nitrogen
b. oxygen and water vapor
c. nitrogen and oxygen
d. oxygen and helium - correct answer ✔c. nitrogen and oxygen
Near Earth's surface, ____ occupies about 78% and ____ about 21% of the
total volume of dry air.
a. nitrogen; oxygen
b. hydrogen; oxygen
, c. oxygen; hydrogen
d. nitrogen; water vapor - correct answer ✔a. nitrogen; oxygen
Atmospheric concentrations of ____ can vary significantly depending on time
and location.
a. hydrogen
b. water vapor
c. helium
d. argon - correct answer ✔b. water vapor
6. The only substance found naturally in the lower atmosphere that can exist
as a solid, a liquid, and a gas is ____.
a. carbon dioxide
b. water
c. methane
d. ozone - correct answer ✔b. water
Which chemical process is an example of condensation?
a. water vapor formation
b. cloud droplet formation
c. photosynthesis
d. ice formation - correct answer ✔b. cloud droplet formation
8. The greenhouse effect is directly enhanced by ____.
a. photosynthesis
b. energy absorption by atmospheric water vapor particles
c. chemical weathering
1. Earth's first atmosphere (approximately 4.6 billion years ago) was most
likely composed of ____.
a. nitrogen and oxygen
b. hydrogen and helium
c. carbon dioxide and nitrogen
d. oxygen and carbon dioxide - correct answer ✔b. hydrogen and helium
The primary source of water vapor and carbon dioxide for Earth's early
atmosphere was most likely ____.
a. photosynthesis
b. ozone reactions
c. outgassing
d. nitrogen chemical reactions - correct answer ✔c. outgassing
The most abundant gases in Earth's present day atmosphere (by volume) are
____.
a. carbon dioxide and nitrogen
b. oxygen and water vapor
c. nitrogen and oxygen
d. oxygen and helium - correct answer ✔c. nitrogen and oxygen
Near Earth's surface, ____ occupies about 78% and ____ about 21% of the
total volume of dry air.
a. nitrogen; oxygen
b. hydrogen; oxygen
, c. oxygen; hydrogen
d. nitrogen; water vapor - correct answer ✔a. nitrogen; oxygen
Atmospheric concentrations of ____ can vary significantly depending on time
and location.
a. hydrogen
b. water vapor
c. helium
d. argon - correct answer ✔b. water vapor
6. The only substance found naturally in the lower atmosphere that can exist
as a solid, a liquid, and a gas is ____.
a. carbon dioxide
b. water
c. methane
d. ozone - correct answer ✔b. water
Which chemical process is an example of condensation?
a. water vapor formation
b. cloud droplet formation
c. photosynthesis
d. ice formation - correct answer ✔b. cloud droplet formation
8. The greenhouse effect is directly enhanced by ____.
a. photosynthesis
b. energy absorption by atmospheric water vapor particles
c. chemical weathering
