What negative effect occurs when there is a decrease in air quality? faster evaporation of water in the soil the drying out of fertile land, resulting in dust bowls the melting of glaciers and polar ice caps increased illnesses that result in a decrease in population

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle