A student was given lines m and n and was asked to construct a line parallel to n through point B. The illustration shows the initial condition and the students partially finished construction. All of the arcs in the illustration were constructed with the compass se at the same setting. Which step should the student perform next to complete the construction?

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.