Marine geologist can predict the age of igneous rocks of the sea floor by measuring _____.
What will be an ideal response?
Magnetic anomalies
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A friend tells you that a heavyweight boxing champion cannot exert a force of 50 N on a piece of tissue paper in midair with his best punch. You
A. disagree, for a good punch easily delivers this much force. B. agree that it can't be done. C. have reservations about this assertion. D. none of the above
Which of the following is a characteristic of commercial agriculture?
A) Most of the production is sold to companies that process the food and sell it to consumers. B) The farmer depends on his or her own production for most food. C) Technology is low. D) A great deal of human labor goes into farming.
Which statement correctly describes hunting and gathering?
A) All humans obtained their food this way before the invention of agriculture. B) It is a form of nomadism. C) This form of subsistence is still practiced. D) Hunter gatherers live in small groups. E) All of these are true.
If no externalities of pollution exist in a particular industry, the interaction of demand and supply _________________________ .
A. is based on benefits individuals perceive while maximizing utility B. is based on choices about production relative to total average costs C. will coordinate social costs and benefits D. shifts so supply has no relation to social costs