As of 2014, more than 20,000 species have been placed on the Red List because
A) they are at high risk of extinction as determined by criteria similar to the criteria for designating endangered species in the United States.
B) these species are considered the most invasive and ecologically disruptive species in their regions.
C) according to the Aichi Biodiversity Targets, they will all become extinct by 2020.
D) international legislation is underway to protect their habitats from further development.
A
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Ultimately, which of the following is the source of energy that continually drives the hydrologic cycle?
a. Gravity b. energy from the sun and gravity c. Electricity d. geothermal energy e. Wind
Which of the following are produced by thermal factors as opposed to dynamic factors?
A. Equatorial low and polar high B. Subtropical high and subpolar low C. Pacific high and Icelandic low D. Aleutian low and Bermuda high
Atoms that have an electrical charge due to a gain or loss of electrons are called ________
A) isotopes B) ions C) periodic elements D) isochrons
"Within a sequence of undisturbed sedimentary rocks, the layers get younger going from bottom to top" is the principle of
A. cross-cutting B. superposition C. original horizontality D. None of these choices are correct.