Over the past half century, El Niño events occurred about every ____ years, on average
A) 2
B) 5
C) 8
D) 10
E) 25
B
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Which of the following can help prevent beach starvation?
a) Lining a river with concrete b) Disrupting longshore transport c) Beach replenishment d) Damming a river e) Sand and gravel mining
Which of the following locations is the most practical for building a wind turbine?
A. a narrow valley B. a region of moderate, steady winds C. a region of strong, gusty winds D. the downwind side of a mountain
Why are ion-dipole attractions stronger than dipole-dipole attractions?
A) The chemical bond in an ion-dipole molecule is similar also a covalent bond. B) The magnitude of the electric charge associated with an ion is much greater. C) Dipole areas are subject to changing from positive to negative regions on the molecule. D) Like charge (dipole) does not attract like charge (another dipole.)
If boulders are deposited high along the sides of a river bed we can concude that the stream was once
much higher than it is today. Indicate whether the statement is true or false.