580 Million Years Ago
DescriptionThe accumulation of atmospheric oxygen allows the formation of an ozone layer, which blocks ultraviolet radiation, permitting the colonisation of the land
RateStrong importance (9)
ozone layer, also called ozonosphere, region of the upper atmosphere, between roughly 15 and 35 km (9 and 22 miles) above Earth’s surface, containing relatively high concentrations of ozone molecules (O3). ... In the stratosphere the temperature of the atmosphere rises with increasing height, a phenomenon created by the absorption of solar radiation by the ozone layer.