If 2 is a variable set to 7, and 2 is again set to 5, what is the value of (int)2+(ob)2?

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.

beth buys 10 x shirts and still has more than 100 in her account

the answer is  

d.

21

i did this one. so you should get it right.