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
B
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Ecosystems contain organic elements only
Indicate whether the statement is true or false.
At virtually any level of use, nonrenewable resources can be ________
A) converted to renewable ones B) converted to nonmetallic minerals C) recycled or reused D) exhausted or depleted E) replenished once depleted
In an aqueous solution that has not reached the saturation point, why won't the ions bond to create mineral crystals?
A) The opposite charges of the ions repel each other. B) The ions are too close together to form a regular internal crystalline structure. C) The motion of the dissolved ions keeps them from joining. D) There are too few ions to make any minerals.
The hydrologic cycle is the circulation of water from one of Earth's systems to another
Indicate whether the statement is true or false