Roof valleys came from from from threes in earths crust white in the valleys were slowly move at a rate of only a few millimeters a year which of these best describes the best type of tectonic activity that forms rift valleys

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explanation:

a chair, a bed, and a toothbrush

explanation:

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.