The running time for movie A is 32 minutes more than twice the running time for movie B. If the running time for movie A is subtracted from triple the running time for movie B, the result is 52 minutes. Find the running times for each movie.

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x:       y:  

-1         4

0         4

1         6

2         18

3         20  

large crystals result from very slow cooling.

evaporation of water: this would produce an evaporite which is a sedimentary rock. like a salt pan in a desert. not possible to have volcanic rocks originate this way.

crystalization in molten earth: slow cooling over time. (hundreds to millions of years)

crystalization at earth's surface: this results in fast cooling. (a few hours to a few months or years)

crystalization from cooling off hot water: that would be a hydrothermal deposit. while associated with volcanics they are not volcanic rocks themselves and usually occur fairly rapidly.