Which of the following is NOT a typical environment in which a sedimentary rock forms?
A. shoreline of a lake
B. heating next to a magma
C. deep seafloor
D. beside glaciers
E. river channels
Answer: B
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Most rural settlements in the United States are
A) clustered. B) dispersed. C) linear. D) clustered circular. E) enclosed.
Any kind of natural hazard can occur in any place at any time.
Indicate whether the statement is true or false.
What will be the role of government in affecting the transition from nonrenewable, polluting energy sources to renewable, environmentally-friendly energy sources?
What will be an ideal response?
Radium-226 is a common isotope on Earth, but has a half-life of about 1600 years. Given that Earth is some 5 billion years old, why is there any radium at all?
A) Radium-226 is one of several self-transmutating isotopes of the elements of the periodic table and is able to replenish itself so that it is never depleted. B) Radium-226 and Radium-218 undergo a series of transmutation reactions of alpha and beta decay to repeatedly become one another approximately every 1600 years. C) Radium-226 is a "daughter" isotope and the result of the radioactive decay of uranium. D) Radium-226 and Astatine-218 are converted back and forth via transmutation to one another at each of their respective half-life cycles.