Although fossils can be made in numerous ways, only a tiny fraction of living organisms leave behind any kind of fossil remnant because
A) most minerals that replace organic material are soluble in water and so dissolve away
B) the vast majority of dead organisms decay long before any mineral replacement can occur
C) the organic material is destroyed by radioactivity
D) they are destroyed by geological processes before mineral replacement can occur
B
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Stars within a cluster that are at the turnoff point
a. have life expectancies that are equal to the age of the cluster. b. are stars that are just becoming white dwarfs. c. are stars that are just entering the main sequence portion of their evolution. d. are stars that are about to supernova. e. are stars that are generally spectral type G stars.
The mass range for neutron stars is:
A) .08 to .4 solar masses. B) .4 to 3 solar masses. C) 1.4 to 3 solar masses. D) 3 to 8 solar masses. E) 6 to 11 solar masses.
Distinguish between the terms slit width and slit separation
Based on the above graph, the average time between maximums of the sunspot cycle is about
A) 110 years. B) 11 years. C) 1 year. D) a few months.