A rock has been formed by the accumulation of bits of minerals and soll that are pressurized together. How should this rock be classified?

organic rocks
igneous rocks
sedimentary rocks
metamorphic rocks

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

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What physical property of gold makes panning a useful way to get gold from streams?