Why isn't dirt listed in the periodic table?
A. Elements like dirt and air are so common that there is no need to list them in the periodic table.
B. Dirt IS listed in the periodic table but is not easily recognized because it is listed as one of the rare earths with its old scientific name, dysprosium, symbol Dy.
C. The periodic table lists only elements made of one kind of material. Dirt is a mixture of elements and compounds.
D. None of the above is true.
Answer: C
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Indicate whether this statement is true or false.
Why is the average depth of the outer edge of the continental shelf (i.e., the shelf break) consistently at a depth of about 135 meters throughout the oceans?
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Which of the following processes will increase permeability of materials?
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The sum of the forces that act on any object moving at constant velocity is
A. equal to its weight. B. about half its weight. C. 10 m/s2. D. zero.