Strontium-90 is a radioactive isotope which is particularly hazardous. Which of the following statements is true about an atom of strontium-90?
A) It contains 52 neutrons.
B) It contains 52 protons.
C) It contains 90 neutrons.
D) It contains 90 protons.
A
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Greenwich, England is the historic reference point for the standardized measurement of
A) human geography. B) physical geography. C) remote sensing. D) GIS and GPS. E) time and space.
Under normal operating conditions ________ power plants release radioactivity as well as toxic metals.
A. Nuclear B. Coal-fired C. Wind-generated D. Hydroelectric E. All of these are correct
Fish with muscular fins attached to the body by a fleshy shaft and a series of articulating bones are ____
a. Tiktaalik roseae b. bony fish c. ray-finned fish d. lobe-finned fish
e. sharksWhy does wave height increase in shallow water?
a) The wave loses energy. b) Wave orbital motion is constricted by the sea bottom. c) Offshore winds blow the water higher. d) The waves tilt because the top gets ahead of the bottom. e) Waves move water toward the shore where it bunches up.