4. Ifa and b are positive numbers explain a-b; describe this situation ovo ways use the idea of the subtraction of gas bags and the addition of sand bags in your explanation

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step-by-step explanation:

11) obtuse

13)right

15) acute

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.

answer: i also need

step-by-step explanation: