* why does one prefesumbrella
even in summer.

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black umbrella provides a better shade

Explanation:

This is because a black umbrella provides a better shade than a white umbrella . Absorption of more light energy from the sun by the black umbrella does not matter because our body is not in touch with the umbrella .

answer: i don't know the answer good luck

explanation:

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.