Every day, tremendous amounts of the sun's energy strike Earth. Why doesn't Earth overheat?
a) The energy mostly is absorbed in various weather systems.
b) Most of the energy is used in photosynthesis to help plants grow and survive.
c) The energy is ultimately radiated back to space.
d) Much of the heat melts rocks, forming lava deep inside of Earth.
Answer: c) The energy is ultimately radiated back to space.
Of the total radiation striking Earth, 30% is reflected back into space by the upper atmosphere, clouds, and Earth's surface. The remaining 70% of solar energy is absorbed by the atmosphere, land, and water, and is eventually radiated back into space as infrared radiation.
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A ____________________ is similar to a food chain, but is much more complex and shows many interconnected feeding relationships
Fill in the blanks with correct word
The religious revival of the post-Soviet era includes:
a. an increase in some Buddhist practices in parts of Siberia. b. more active Christians--both Orthodox and Protestant c. the re-emergence of Islamic practices, especially in the Central Asian states. d. All of the above.
Phytoplankton are primary producers
a. True b. False
Carbon dioxide concentrations in the Northern hemisphere fall from spring through autumn as carbon is taken up in growing plants, and rise through the winter as organic matter decays
Indicate whether the statement is true or false.