A nuclear chain reaction occurs
A. when an atoms splits.
B. when neutrons released from a splitting atom colliding with the nucleus of another atom, causing it to split.
C. when the nuclei of several atoms split simultaneously.
D. when a rapidly moving neutron collides with an electron causing it to split into neutrons and other particles.
Answer: A
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Petroleum and oil reserves are often found in sedimentary rocks because
A. these rocks can contain fossilized organic matter. B. these rocks are very porous and permeable. C. chemical changes occur to create these reserves. D. oil accumulates in the sediments.
We deal with toxic substances every day. All of the following are methods used to limit risk from exposure to toxic substances EXCEPT
A. establishing a level (threshold level) below which exposed test animals show no reaction. B. setting limits to the amount of exposure a person is allowed to receive in the workplace. C. subjecting test animals to a substance to see if they become ill or die. D. prohibiting the use of toxic substances by the public.
The time necessary for one-half of the original number of radioactive atoms of an element to decay to a stable
daughter product is known as a(n) ____. a. scale b. metamorphosis c. half-life d. alpha decay e. relative age
The ecological efficiency of herbivores and carnivores is estimated by most authorities to be roughly:
a. 1 percent. b. 10 percent. c. 30 percent. d. 90 percent.