Which of the following is NOT a feature of a low gradient river?
a. floodplain
b. levee
c. alluvial fan
d. oxbow lake
e. point bar
C
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Industrial disposal ponds should not be placed
A) over any groundwater, ever B) in a groundwater discharge area C) over a groundwater recharge area D) near factories that produce the waste E) in any place where it rains often
Even if distinctive features that might indicate a tornado are observed on radar, a tornado must be
observed visually before a tornado warning is issued. a. true b. false
Eruptive activity at the summit of the Nevada del Ruiz volcano in Colombia in 1985 caused snow and ice to melt, generating a ________ that killed 23,000 people in the village of Armero.
A. gas cloud B. mud flow C. hyaloclastic flow D. lava flow E. pyroclastic flow
Why do the planets "drift" east relative to the stars and then move west for periods of time?
A) They are moving in the same rotation sense as the earth around the sun, but as the earth moves faster (or slower, depending on the planet) the motion appears to be backwards. B) They are moving in large elliptical orbits, so when observed from Earth, their motion changes depending on whether they are near or far from the sun at a given time. C) They are moving in separate orbits around the sun as it goes around the earth, producing the periodic backtracking. D) They don't move, they stay fixed relative to the stars.