Nearly all large optical telescopes built today are ________
A) reflectors
B) radio
C) refractors
A
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Which of the following is not a type of tectonic plate boundary?
A. transform plate boundary B. fault plate boundary C. convergent plate boundary D. divergent plate boundary
Which of the following is true of the Sun's electromagnetic spectrum?
A) It consists exclusively of streams of charged particles. B) It consists exclusively of radiant energy made of gamma ray, X-ray, and ultraviolet wavelengths. C) It consists of gamma ray, X-ray, ultraviolet, visible, and infrared wavelengths. D) It consists exclusively of visible light and infrared energy. E) It consists primarily of microwaves and radio waves.
Sri Lanka as a whole is the most densely populated country in the Asian region
Indicate whether the statement is true or false
The American alligator was almost hunted to extinction, but was protected starting in the late 1960s and has made a remarkable recovery. Which best describes the change in overall biodiversity that occurred from 1960 to 2000 in ecosystems due to changes in alligator population? Confine your analysis to ecosystems where alligators are native and ignore the contribution due to changes in the alligator population.
A. increased B. decreased C. stayed the same D. impossible to determine