What is the area of an equilateral triangle that has a perimeter of 36 centimeters? Round to the nearest square centimeter. 15 square centimeters 25 square centimeters 62 square centimeters 72 square centimeters.

i don't see any steps below, sweetheart

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.