A single parrot fish can eat enough coral to excrete 1 tonne of sand within a year. On some islands in the Maldives, up to 70% of all beach sand comes from parrot fish. Plant roots spread out and intertwine as the plant itself grows. These roots help hold soil together like a type of living glue. Plant roots make riverbanks more solid so instead of spreading outward, plants cause rivers to get deeper, and then begin to wind and switch back on themselves. Limestone is soft because it’s made of sh...
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