The principle of ________ states that the physical, chemical, and biological processes at work shaping the Earth today have also operated in the geologic past
A) catastrophism
B) plate tectonics
C) plutonism
D) Uniformitarianism
Answer: D
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The Coast 2 Coast SDI corridor runs from South Africa through Botswana and:
A) Namibia B) Swaziland C) Nigeria D) Lesotho
Some planktonic cyanobacteria have the ability to "fix" which of the following elements, thus having a fertilizing effect on the marine environment similar to the ability of the land plants legumes?
A. hydrogen B. oxygen C. nitrogen D. helium
The oceans cover approximately ________ percent of Earth's surface
A) 70 B) 60 C) 40 D) 50
__________ in the African Transition Zone continues, as natural conditions and human activity place pressure on the region through overgrazing and the lack of precipitation.
Fill in the blank(s) with the appropriate word(s).