A construction team is building several buildings. They want the average time spent on each building to be 15 hours or less. So far, they have spent thr following times for the first 4 buildings:17 hours, 10 hours,19 hours, 13 hours. How many hours should thry spend building ghr fifth building in order to match there goal of an average of 15 hours or less?

the line of

b

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.