True or False: Limestone, composed mainly of calcite, can form by both inorganic and biologic processes
Indicate whether this statement is true or false.
Answer: TRUE
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What causes the seafloor to deepen across a typical continental slope?
A. thinning of continental crust because of normal faults and a transition from continental crust to oceanic crust B. thinning of continental crust because of normal faults C. deposition of sediment from turbidity currents D. down flexing of oceanic crust because of subduction E. a transition from continental crust to oceanic crust
Nitrates often used for gunpowders, explosives, and fertilizers (when combined with positive ions such as potassium, sodium, and calcium) have the chemical formula
A) N2. B) N2O. C) NO2. D) NO
Population growth scenarios project that at medium fertility rates the world population will level off at 10 billion.
Answer the following statement(s) true (T) or false (F)
The measure of how harmful a substance is called its ____________.
Fill in the blank(s) with the appropriate word(s).