What role do fungi play in the formation of fertile soil?
A) They are a source of minerals.
B) They carry out chemical reactions that convert carbon dioxide to nitrogen.
C) They decompose organic material into compounds plants can use.
D) They add air to soil.
C
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According to environmental writer Bill McKibbin, "the great environmental story of the United States, and in some ways, the whole world" is the
a. restoration of grasslands b. regrowth of forests c. production of biofuels on forest land d. restoration of aquatic ecosystems e. restoration of saguaro cactus stands
Explain the formation of a geostrophic wind.
What will be an ideal response?
The name “ozone hole” is a misnomer. In reality it is not a hole, but rather:
a) two holes, one over the north and one over the south pole. b) seasonal changes in the size of the ozone. c) an irregular shaped formation stretching to the tropics. d) the thinning of the upper atmosphere ozone layer.
Lava rocks formed less than 800,000 years ago are found to have a different _____ than lava rocks formed over 1.5 million years ago.
A ) magnetic polarity B ) mineral composition C ) magnetic strength D ) precious metal content