Asked by ulyjh,b
Stromatolites form when (1 point)
volcanoes erupt and kill surrounding organisms.
cyanobacteria grow on top of rocks and harden as others grow on top of them
continents drift apart and isolate areas of the biosphere.
oxygen reacts with iron in rocky layers.
volcanoes erupt and kill surrounding organisms.
cyanobacteria grow on top of rocks and harden as others grow on top of them
continents drift apart and isolate areas of the biosphere.
oxygen reacts with iron in rocky layers.
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cyanobacteria grow on top of rocks and harden as others grow on top of them
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