22 rocks from precambrian time have been changed and

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Unformatted text preview: wamps had tropical vegetation like large trees, seed ferns and rushes in a hot environment with giant insects and stagnant water. 22. Rocks from Precambrian time have been changed and altered by rock cycle processes like weathering and erosion, heat and pressure and melting. (Plate tectonics, etc.) 23. During Precambrian time, as bacteria added oxygen to the atmosphere through photosynthesis, much of the oxygen reacted with sedimentary rocks on the surface to form rust (i...
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