The temperature of a 24.5-g block of gold decreases from 30℃ to 21℃. How large is the change in thermal energy of the block of gold? Show your calculations.

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.