George wishes to increase the percent of acid in 50ml of a 15% acid solution to 25% acid, how much pure acid must he add?
step by step plz : )

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.

hello, it is c -4

hope i you have a good day

the terms in pattern b are 4 times the terms in pattern a