Why can radioactive elements be used to determine the ages of rocks?
A. Their half lives do not change over time.
B. Their half lives decrease predictably over time.
C. Their half lives increase predictably over time.
Answer: A
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Family size is large in much of Sub-Saharan Africa for all of the following reasons, EXCEPT
A) rural lifestyle. B) most women do not have high levels of education. C) young marrying age of women. D) infant and child mortality rates are low. E) birth control methods are neither readily available nor universally accepted.
The main purpose of geological maps is to show the shape of the Earth's surface. Indicate whether the statement is true or false
When a rising parcel of air reaches the ____________________ ____________________ ____________________ its relative humidity reaches 100 percent and a cloud begins to form
Fill in the blank(s) with correct word
Which of the following statements comparing a tidal power electricity-generating with a conventional thermal power plant is correct?
A) The initial cost of building a tidal power electricity-generating plant may are higher. B) The operating costs of a tidal power electricity-generating plant are higher. C) The periodicity of the tides is an advantage of a tidal power electricity-generating plant. D) Tidal power initially requires fossil or nuclear fuels to get started. E) Conventional thermal power is considered a cleaner and renewable resource.