Identify square root of 3 as either rational or irrational, and approximate to the tenths place. Rational: square root of 3 ≈ 1.7

Irrational: square root of 3 ≈ 1.7

Rational: square root of 3 ≈ 1.8

Irrational: square root of 3 ≈ 1.8

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.

can you post a picture or something

it should be described as a proper fraction.