Which of the following statements is always true?
a. Pressure always increases when force increases or the area acted on increases,
b. Pressure always increases when force increases or the area acted on decreases,
Pressure always increases when force decreases or the area acted on increases,
d. Pressure always increases when force decreases or the area acted on decreases,
C.
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the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

a.   mass number from atomic number

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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