What effect does a large volcanic eruptions typically have on the atmosphere?
A) warming for several years
B) cooling for one or two years
C) cooling for several decades
D) increases in CFCs
B
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Technological advances can always be relied upon to provide solutions to our environmental problems
Indicate whether the statement is true or false
What is an example of a K-selected species?
A. goats B. bacteria C. whales D. flies E. frogs
Which region of Africa is a major natural gas producer?
A) Central Africa B) the Horn of Africa C) Southeastern Africa D) in the Sahel of Northern Africa E) Southwestern Africa
What are the relative compositions of the materials from which stars form?
A) about 74% hydrogen, about 24% helium, no more than 2% other materials B) about 24% hydrogen, about 74% helium, no more than 2% other materials C) about 2% hydrogen, about 74% helium, no more than 24% other materials D) Stars have vastly differing combinations of materials.