If you stand on a pair of bathroom scales, explain how the readings change as you shift your weight gradually from side to side. What rule governs the readings on the scales?
What will be an ideal response?
The equilibrium rule guides the scale readings. That is, the total of the readings adds to equal your weight. Then the net force on you is zero at all times. The scales push up as much as gravity pulls you down. For example, stand evenly and the readings are the same. Shift more weight on your left foot and the reading on the left scale increases. Its gain is equal to the loss of reading on the scale supporting your right foot.
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Amenity migration is driven by two types of migrants,
A) the wealthy and the retired. B) tourists and business owners. C) illegal and undocumented workers. D) young families and job hunters.
In the lower troposphere
A) causes lung irritation, asthma, and susceptibility to respiratory illness in humans. B) is not associated with transportation. C) has not been found to cause any damage to crops and plants. D) forms acid rain.
Lithospheric plates move on the Earth's surface because ____.
a. warm mantle ascends at ridges and cool mantle descends at subduction zones b. convection occurs only in the asthenosphere c. cool mantle ascends at ridges and warm mantle descends at subduction zones d. warm mantle ascends at ridges and cool mantle descends at subduction zones AND convection occurs only in the asthenosphere e. convection occurs only in the asthenosphere AND cool mantle ascends at ridges and warm mantle descends at subduction zones
The ________ is another name for the latitude and longitude coordinate system
A) gnomon B) meridian C) plane coordinate system D) graticule E) great circle system