According to the U.S. Environmental Protection Agency, one of the five top toxic substances of major concern to human and environmental health is
A. sodium.
B. lead.
C. oxygen.
D. gold.
E. polonium.
Answer: B
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The age of the universe is estimated by the:a
temperature of the universal background radiation. b. age of comets formed in interstellar space. c. rate at which galaxies are moving away from one another. d. age of subatomic particles as determined by radioactive decay. e. age of the sun.
Why is soil development critical to a soil's ability to support plant growth?
What will be an ideal response?
Increased atmospheric CO2 may lead to plants in some regions of the world producing more leaves
Indicate whether the statement is true or false
Streams generally receive their water from two sources. What are those two sources?
A) Lakes and meteorites B) Meteorites and comets C) Overland flow and groundwater D) Groundwater and evaporation