When will a deepwater wave change to a shallow water wave as it approaches shore?
A) Wave period > twice the water depth
B) Wavelength = 1/2 water depth
C) Wavelength = 2 times water depth
D) Wave period > 1/2 water depth
Answer: C
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Scientists have estimated the density of Earth
A) by averaging the density of several hundred crust samples. B) by measuring the wobbly rotation of Earth on its axis. C) by calculating its interaction with nearby celestial objects. D) by taking a drilling core and averaging the density of those rocks over the depth.
In the scientific method, a ________ is an educated guess, while a _____ has been rigorously tested and confirmed.
A. theory; hypothesis B. hypothesis; theory
World population has been growing more and more rapidly over the past several millennia.
Answer the following statement true (T) or false (F)
Which of the following is not an example of a point source?
A. a septic tank B. effluent produced by a paper mill C. a storm sewer outflow D. runoff from pastureland