Can anyone explain me step two (in red)?
Thanks in advance.

all it means is function 3

ii6tyhj7 juj3yyj333ju jmyhthhtk7h jg hajj jiijh

hi how are you doing today? if you ever need just tell me

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.