Distances to stars are often measured in parsecs rather than in light years. one parsec is about 3.26 light years. use scientific notation to write the number of kilometers in one parsec to three significanr digits

answer is : muchas/tipicas

have a nice day!

~recklesschicken

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.