<P> The scientific consensus is that the anthropogenic greenhouse gases currently accumulating in the atmosphere are the main cause of global warming . </P> <P> Air pollution is the introduction into the atmosphere of chemicals, particulate matter or biological materials that cause harm or discomfort to organisms . Stratospheric ozone depletion is caused by air pollution, chiefly from chlorofluorocarbons and other ozone - depleting substances . </P> <P> On October 19, 2015 NASA started a website containing daily images of the full sunlit side of Earth on http://epic.gsfc.nasa.gov/ . The images are taken from the Deep Space Climate Observatory (DSCOVR) and show Earth as it rotates during a day . </P> <Table> <Tr> <Td> <Table> <Tr> <Td> </Td> </Tr> <Tr> <Td> Blue light is scattered more than other wavelengths by the gases in the atmosphere, giving Earth a blue halo when seen from space . </Td> </Tr> </Table> <Table> <Tr> <Td> </Td> </Tr> <Tr> <Td> The geomagnetic storms cause beautiful displays of aurora across the atmosphere . </Td> </Tr> </Table> <Table> <Tr> <Td> </Td> </Tr> <Tr> <Td> Limb view, of Earth's atmosphere . Colors roughly denote the layers of the atmosphere . </Td> </Tr> </Table> <Table> <Tr> <Td> </Td> </Tr> <Tr> <Td> This image shows the Moon at the centre, with the limb of Earth near the bottom transitioning into the orange - colored troposphere . The troposphere ends abruptly at the tropopause, which appears in the image as the sharp boundary between the orange - and blue - colored atmosphere . The silvery - blue noctilucent clouds extend far above Earth's troposphere . </Td> </Tr> </Table> <Table> <Tr> <Td> </Td> </Tr> <Tr> <Td> Earth's atmosphere backlit by the Sun in an eclipse observed from deep space onboard Apollo 12 in 1969 . </Td> </Tr> </Table> </Td> </Tr> </Table>

What are the properties of the layer of the earth