as the things of land in a mind of land eruptions , the land oxygen will sunset / decrease especially at the middle of that mind of land
world has oxygen_and_nitrogen_atmosphere eruption is action. ozone_layer_of_atmosphere is dimishing_as_time_goes_by. ozone is gas_in_atmosphere. volcano is land_topographical_feature. sunset is atmospheric_phenomenon. ozone is gas_floating_in_air. earth's_atmosphere has oxygen land is object. sky is gas.