Thin films of water on sand grains ____
a. ?can either increase or decrease cohesion depending on grain size
b. ?reduce cohesion and increase resisting forces
c. ?reduce cohesion and decrease resisting forces
d. ?increase cohesion and decrease resisting forces
e. ?increase cohesion and increase resisting forces
ANSWER: e
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On the topographic map in Figure 43-3, determine the extent of inundation for the 20-year flood along Cache Creek that you calculated in problem 8:
(a) Convert your flood level height in problem 8 from meters to feet (the measurement units used on the map): Water height of 20-year flood: _______ feet (b) Using a blue pencil, shade in the extent of the 20-flood on the map. Note that elevation of the stream gage is 1534 feet and that dashed lines are 20-foot contours.
During a lightning event
A) a large quantity of electrons is transferred. B) there is typically only one stroke. C) the negative charge near the bottom of the cloud increases. D) the air around the conducting channel is heated to temperatures up to 30,000 K.
During a cold occlusion, the cold front forces the warm front to ____
A) become stationary B) rise off the ground C) move to the side D) dissipate
You are studying an outcrop where the base layer is limestone and the layer directly on top of that is sandstone. Near the base of the sandstone are small, weathered pieces of limestone entirely contained within the sandstone
Explain how these pieces of limestone came to be contained within the sandstone. What will be an ideal response?