The wavelengths emitted by the earth are:
A) ultraviolet.
B) about the same as those emitted by the Sun except when the Sun is experiencing sunspots.
C) longer than those emitted by the Sun.
D) shorter than those emitted by the Sun.
C
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Biomes are
a. large aquatic regions of the earth with distinct climate and certain species adapted to them b. large terrestrial regions of the earth with distinct climate and certain species adapted to them c. groups of populations living in harmony in a given ecosystem d. all the biological portions of the planet e. types of forests that are extensive and widespread on a continent
A division on the geologic time scale represents ____
a. the passage of 500,000 years. b. the passage of 250 million years c. an increase in reptilian poopulation by 100,000 d. an increase in population of all living organisms by one million e. a distinctive event in the rock record
If a material has a half-life of 24 hours, how long do you have to wait until the amount of radioisotope is 1/4 its original amount?
A. 72 hours B. 48 hours C. 12 hours D. 24 hours E. practically forever, but it may be safe by then
Japanese whalers hunt whales despite the global ban, based on what argument?
A) harvest is "research" B) harvest is "commercial" C) harvest is "cultural" D) all of the above E) none of the above