Answer:
Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. ... Slate is frequently grey in color, especially when seen, en masse, covering roofs.
South America, Brazil, Canada, And Hawaii
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It makes a longitudinal wave because it stretches and compresses while it slithers forward
The answer is "lipids"
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