27. a rock inside a building is not likely to be affected by (2 points) chemical weathering any of these biological weathering mechanical weathering 28. fertilizers can put extra nitrogen into coastal waters, which can cause (2 points) overgrowth of algae that produce toxins too many fish which depletes oxygen a change in the water's temperature the water to become too salty 29. name and describe two types of mechanical weathering. (4 points) writing part 30.if scientists determine the age of a rock to be three billion years old, what else do they know? (2 points) the rock came from outside the solar system the rock was part of a comet the earth is at least three billion years old the earth is younger than three billion years old
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