There are 50 bacteria in a test tube. after one hour, the number of bacteria is 100. after two hours, the number of bacteria is 200. after three hours, the number is 400. suppose the growth continues at this rate. which expression shows the number of bacteria after n hours?

1.3 million hoops i believe

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.