Biology: Which of the following is not part of Earth’s

Subject: Biology / General Biology
Question
Which of the following is not part of Earth’s climate system?

Biosphere

Exosphere

Geosphere

Atmosphere

Hydrosphere

Variations in Earth’s orbit that influence long-term climate changes include ________.

the wobbling of Earth’s axis of rotation (precession)

eccentricity, obliquity and precession

the shape of Earth’s orbit (eccentricity)

the tilt of Earth’s axis of rotation (obliquity)

Of the following natural factors, which have caused past climate changes on Earth? Choose all that apply.

volcanic eruptions

burning of fossil fuels

changes in solar energy

variations in Earth’s orbit

Which of the following human-generated gases makes the greatest relative contribution to increasing the greenhouse effect?

Carbon dioxide (CO2)

Chlorofluorocarbons (CFCs)

Methane (CH4)

Nitrous oxide (N2O)

Water vapor

How much are global surface temperature expected to increase by the year 2100 if humans replace much of today’s fossil fuel combustion by new and more efficient technologies?

2°C

2.5°C

4°C

3.5°C

3°C

The current level of atmospheric ________ recently surpassed 400 parts per million.

chlorofluorocarbons

water vapor

nitrous oxide

methane

carbon dioxide

Which of the following nutrients can limit primary productivity by phytoplankton? Choose all that apply.

calcium

silica

nitrates

iron

phosphates

carbon dioxide

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