volcanic ash in the atmosphere decreases the temperature by blocking the sun
cloud has not effect_of_partially_blocking_sunlight gloom is not atmosphere. volcanic_eruption is emitting. volcanic_eruption is not emitting. sunlight has effect_of_heating_earth partially_blocking_sunlight has not effect_of_cooling_earth atmospheric_layer is not gas. sunlight has not effect_of_heating_earth partially_blocking_sunlight has effect_of_cooling_earth cloud has effect_of_partially_blocking_sunlight