An earthquake sends out mechanical waves in all directions from its source. These waves travel through different materials in the Earth. Properties of a wave change when it moves from one material to another. What property of a wave changes as it moves from one material to another?

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When a lake, river or other aquatic  system  becomes  eutrophic, it can have serious negative effects on other organisms like fish, birds and even people.if an algal bloom is so bad that it causes wide-spread death  in  the  water, the organisms that die will all sink to the bottom and start to decompose.