Nitrates and phosphates are examples of
a. disease-causing agents
b. oxygen-demanding wastes
c. organic chemicals
d. plant nutrients
e. Sediment
D
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Which statement describes turbidites?
A) They are graded layers of terrigenous sand mixed with finer pelagic sediments. B) They are propelled into position by gravity rather than water currents. C) They are composed of distinct layers that represent various turbidity current events. D) All of these choices are true about turbidites.
Which of the following is the definition of a scientific theory?
A) The gathering of data through observations B) A tentative explanation used to explain observed activities C) A well-tested and widely accepted view that explains observable facts D) An educated guess
15. ?The danger of volcanic ash is increased when ____
a. ?it is composed of hydrogen sulfide compounds b. ?the volcano creates rain, making building collapse more likely c. ?dry conditions allow it to collapse quickly to form tuff d. ?it contacts and melts snowbanks, resulting in flash floods e. ?the flammable ash comes into contact with fire or high heat
What is the name of the lightest hydrocarbon which has cis and trans isomers?
A) 1-butene B) 2-butene C) 1,2-dimethylcyclopropane D) propene