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In classical geometry, a line is a perfectly thin, perfectly straight geometrical shape which extends to infinity without changing direction; it is one dimensional. A line can be generated by connecting any two points in the most direct way, which creates a line segment, and then extending that segment in exactly the same direction.
It depends on the species of grain, though most are from 50 to 60 pounds to a bushel.
Grain elevator explosions are most likely caused by the ignition (through friction or static electricity) of grain dust that floats in the air within the grain elevators. This same type of explosion can be found in soap factories and candy factories.
I would have to say half a miligram - one miligram at the most.
Hopefully the same thing it means in most other grades of geometry, which is a straight one dimensional object that is infinitely long. It differs from a ray, which has a finite point and extends infinitely from that point in a single direction, and a line segment, which has two finite ends.