True, they used them because its easier to trade coins than products
Answer:Extreme pressure from burial, increasing temperature at depth, and a lot of time, can alter any rock type to form a metamorphic rock. If the newly formed metamorphic rock continues to heat, it can eventually melt and become molten (magma). When the molten rock cools it forms an igneous rock.
Explanation:
Work = Force x Distance = 500 x 4 = 2000 Nm = 2000 J
