Why can't the carbon dioxide cycle easily correct for the increasing amounts of carbon dioxide introduced into our atmosphere by industrialization?
A) it operates far too slowly to correct for any short-term changes
B) pollution has stopped the carbon dioxide cycle from operating
C) the carbon dioxide cycle only influences carbon dioxide produced by natural sources
D) it operates far too quickly to correct for any short-term changes
A
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The full moon rises around sunrise, and sets around sunset
Indicate whether the statement is true or false
Solar-type stars in our galaxy are
A) very common, making up about 50% of the total B) very rare (less than 1%) C) fairly common (several percent) D) the most common type of stars in our galaxy (75% or more)
When a shower is turned on, the shower curtain moves towards the water spray. This partly involves
A) capillary action. B) surface tension. C) pressure changes in moving fluids. D) none of the above
A very light cart holding a 300-N box is moved at constant velocity across a 15-m level surface. What is the total work done in the process?
a. 4500 J c. 20 J b. 1/20 J d. zero