Question 1
pts
While microbes may have existed on Earth as far back as 3.7 billion years ago, there is not
evidence of animals on Earth (in the ocean at first) until about 600 million years ago . Fill in the
blank with the correct answer.
Answer 1:
Correct!
600 million years ago
Question 2
pts
Match the event with the approximate time.
Correct!
Age of Earth
4.6 billion years
Correct!
Microscopic life emerged on Earth
3.7 billion years ago
Correct!
Animals emerged on Earth
600 million years ago
Question 3
pts
Which fuels were formed in the lithosphere, over millions of years, from prehistoric plants and
animals that died and were buried by layers of rock? Select all that apply.
Correct!
coal
Correct!
oil/petroleum
geothermal vents
Correct!
natural gas
uranium
Question 4
pts
Which two Earth spheres are described in this interaction? "Beavers and humans can alter the
flow of water and where it is stored in reservoirs by building dams." Select the two spheres that
are described.
Correct!
hydrosphere
atmosphere
Correct!
This study source was downloaded by 100000881663784 from CourseHero.com on 09-10-2024 18:35:56 GMT -05:00
Question 5
pts
This statement describes an interaction between which two Earth spheres? "Water condenses
around particulates (such as dust particles) to form clouds and precipitation." Select both correct
answers.
Question 6
pts
How does air pressure change as altitude (distance from Earth's surface) increases?
air pressure does not change
Correct!
air pressure decreases
the relationship between air pressure and altitude is erratic and unpredictable
air pressure increases
Question 7
pts
Earth's atmosphere, and the gases in it, has evolved over time. Order the following periods of
Earth's atmosphere from earliest to most recent.
You Answered
2
Oxygen levels in the oceans and atmosphere increased enough that many new life forms
evolved. They could use oxygen directly from the ocean and atmosphere.
Correct AnswerCyanobacteria (microscopic organisms) developed in Earth's oceans as Earth's
first photosynthetic organisms - releasing oxygen into the atmosphere. The amount of oxygen in
the atmosphere reached one percent of today's levels (so about 2% as compared to 21% of air
today).
Correct!
1 (earliest atmosphere)
As Earth cooled early on, its atmosphere was influenced primarily by volcanoes. It included
mostly hydrogen, sulfide, methane and LOTS of carbon dioxide.
This study source was downloaded by 100000881663784 from CourseHero.com on 09-10-2024 18:35:56 GMT -05:00
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