Which of the following terms refers to the process that produces crepuscular rays in the atmosphere?
A. diffraction
B. scintillation
C. dispersion
D. scattering
Answer: D
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Fish with limbs containing a fleshy shaft and a series of articulating bones; one of two main
groups of bony fish:a. chordates d. Ichthyostega b. ostracoderms e. labyrinthodonts c. lobe-finned fish
Why were trees knocked down for tens of kilometers north of Mount St. Helens?
A. The blast effect swept over them. B. The lava swept over them. C. A landslide swept over them.
Which of the following characterizes the history of impacts on Earth as deduced by impact history on other terrestrial planets?
A) Impact rates were very high in the early history of the earth, but dropped off after about the first 1 billion years of Earth history to a nearly constant rate since that time. B) Impacts were more intense in the early history of the earth but have continued at about half the rate of bombardment since about 4.4 billion years ago. C) Impacts continued at a fairly constant rate throughout the 4.5 billion year history of the solar system. D) All major impacts occurred in the first 100 million years after the solar system formed.
A community with hundreds of different types of primary producers, a few herbivores and only one carnivore, has
A. Little complexity B. Low productivity C. A great deal of complexity D. A great deal of productivity E. Little diversity