Kala received a $70 gift card for a coffee store. She used it in buying some coffee that cost $8.58 per pound. After buying the coffee, she had 18.52 left on her card. How many pounds of coffee did she buy?

answer: x=60

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.

the answer is 0.8in^2

hope you get it down chief.