Why are smaller nuclei such as carbon-14 often radioactive? (carbon-12 is the most common and most stable form of carbon.)
A) The attractive force of the nucleons has a limited range.
B) The isolated neutron is not stable and will undergo spontaneous transformation into a proton and an electron.
C) Hmmm... mysterious are the ways of the force.
D) both A and B
E) none of the above
B
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The visible surface of Uranus and Neptune are bluish-green because they consist of
A. blue glacial ice. B. methane and other gases. C. oceans of liquid water. D. materials that are very cold because they are very far from the Sun.
Sediments are called ________ when they contain at least ________ biogenous sediments
a. terrigenous; 20% b. oozes; 70% c. terrigenous; 30% d. oozes; 30%
Which of the following is an unsaturated fatty acid?
A) arachidonic acid B) palmitic acid C) stearic acid D) none of these
During the Northern Hemisphere’s summer, the daylight hours in northern latitudes are ____________________ than in middle latitudes
Fill in the blank with correct word.