Formation of entrenched meanders can result from a
A) low-gradient river followed by downcutting.
B) braided river that later exceeds its capacity to carry sediment.
C) braided river followed by regional uplift.
D) steep-gradient mountain stream following by an increase in precipitation.
A) low-gradient river followed by downcutting.
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Judge the following sentence according to the criteria given below: The true value of the ecological efficiency in populations important to present fisheries is of practical importance BECAUSE it determines the size of the fish harvest that can
safely be taken from the oceans without damaging the ecosystem. A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.
How do geologists know that the magnetic field of Earth has changed constantly over time?
A) by the direction of historical lava flows, which they have been able to date with radioactive dating methods B) by crystals that have formed in metamorphic rocks C) by records kept in magnetic rock-forming minerals D) by analyzing and extrapolating records kept by scientists since the 1600s
Renewable primary energy sources include all of the following except ________
A) biomass B) sunlight C) natural gas D) wind E) ocean tides
Numerical models are now being used to predict small-scale weather for the next few minutes, a process called ____________________
Fill in the blank(s) with correct word