Halos are caused by ____
a. refraction of light passing through raindrops
b. scattering of light by ice crystals
c. refraction of light passing through ice crystals
d. diffraction of light by cloud droplets
e. reflection of light by ice crystals
ANSWER: c
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How are disconformities different from uncomformities?
A) They are the same. B) A disconformity has uniformly layered sediments whereas an uncomformity has horizontal layers with angular beneath or above. C) A disconformity has horizontal layers with angular beneath or above whereas an unconformity has uniformly layered sediments. D) A discomformity is older than an unconformity.
Which of the following is not involved in regulating control at the transcriptional level?
A) enhancers B) promoters C) response elements D) tRNAs
A region with a low annual rainfall total is more likely to be classified as dry if the majority of precipitation is concentrated during the ____ months, when evaporation rates are greater
a. warm autumn b. cool spring c. cold winter d. mild spring e. warm summer
Life of a single tree begins with a(n) ________
A) seed B) angiosperm C) conifer D) cone E) flower