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Unformatted text preview: 3. Which of the following terms, borrowed from biology, describes a chunk of ice at the center of a comet? a. Mitochondrion b. Hypothalamus c. Hypothermia d. Nucleus ( CORRECT ANSWER ) 4. Which of the following elements, discovered in high concentrations in sediment, is associated with the idea of the mass extinction of dinosaurs? a. Technetium b. Thallium c. Iridium ( CORRECT ANSWER) d. Proactinium 5. Dust tail particles are pushed away from the Sun by which of the following effects? a. Radiation pressure ( CORRECT ANSWER ) b. Accretion c. Comet disintegration d. Nucleic formation...
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- Fall '11