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