Color and luster are two ways to identify an unknown metal. Other ways include weight and composition.
The holocaust kiddo!! May they rest in peace!!
The answer is: "delta" .
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The sea erodes rocks with hydraulic action and abrasion. More and more erosion occurs making the rock more steeper until it forms a cliff.
<span>The Mesopotamians made sails to harness the wind to move boats, and eventually sailed and traded as far away as what is now India.
It allowed them to trade good with faraway lands</span>
