11 Jun Which of the following is not part of Earth’s
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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