Flip a coin 10 times and record the observed number of heads and tails. for example, with 10 flips one might get 6 heads and 4 tails. now, flip the coin another 20 times (so 30 times in total) and again, record the observed number of heads and tails. finally, flip the coin another 70 times (so 100 times in total) and record your results again.
we would expect that the distribution of heads and tails to be 50/50. how far away from 50/50 are you for each of your three samples? reflect upon why might this happen?

98%

step-by-step explanation:

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.