The color of a soil reflects
A. type of vegetation growing on the soil.
B. development of peds.
C. degree of soil horizon maturity.
D. organic matter content (brown or black) and iron content (red).
Answer: D
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The species area relationship concept suggests that if 90% of a coral reef is lost
a. 90% of the species utilizing the reef will go extinct. b. 100% of the species will go extinct. c. 50% of the species will go extinct. d. 35% will go extinct. e. There will be no loss of species.
The main hazard of an eruption that forms a large caldera is
A) burning, building collapse, and suffocation from an eruption column and pyroclastic flows. B) volcanic mudflows and landslides. C) hot fragments thrown a short distance from the volcano. D) destruction by moderately fluid lava flows that can flow far from the volcano.
International migration has decreased considerably in recent decades as economic disparities lessen between wealthy and poor regions
Indicate whether the statement is true or false.
To use the VSEPR model to determine the geometry of a molecule we need to know which of the following?
A) the number of atoms in the molecule B) the number of atoms bonded to the central atom C) the number of lone pairs around the central atom D) both b and c