A stream sorts particles by size, transporting the sizes that it can and depositing larger ones
a. True
b. False
Indicate whether the statement is true or false
True
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____________________ poisoning, mostly affecting children, can cause mental retardation and brain damage.
Fill in the blank(s) with the appropriate word(s).
Cracks where displacement of rock has occurred are called
A) faults. B) sills. C) joints. D) dikes.
The reason that the daily maximum temperature is after the maximum solar heating is because:
A) the Sun has more energy when shining from the west. B) the atmosphere is "thinner" in the afternoon. C) there is a thermal "lag" in the heating of the atmosphere. D) None of the above. There is no relationship between the maximum amount of sunshine and the time of maximum daily temperature.
Increased availability of contraceptives in very poor nations is unlikely to decrease family size because
A) families depend upon children for labor and support when the parents become old. B) infant and childhood mortality rates are already keeping family sizes small. C) the increased use of industry and technology has already decreased family size. D) poor families are already small because parents cannot afford to feed and house more than one or two children.