The scale on the map explains that 2.5cm stand for 45 miles. What is the distance between to cities if they are 7cm apart?

thats not a system of equations, that is a solution

answer: c. is your answer

step-by-step explanation: get me a black leather coat

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.