| A | B |
|---|
| Aquaculture is | the raising of aquatic animals for human consumption. |
| Smog is | a mixture of chemicals that occurs as a brown-gray haze over the atmosphere. |
| Pollutant | is a harmful material that can enter the biosphere through land, air or water. |
| Acid rain can also dissolve and | release toxic elements such as mercury into the biosphere. |
| Acid rain can | kill plants by killing their leaves and changing the soil chemistry. |
| Acid Rain is caused when | many combustion processes , such as burning fossil fuels, releases nitrogen and sulfur compounds into the atmosphere and then mix with water vapor in the air. |
| biodiversity | valuable because the species of many kinds have provided us with foods, industrial products and medicines. |
| Examples of benefits from biodiversity are | the foods we eat, and medicines like painkillers, antibiotics, heart drugs , antidepressants and anticancer drugs. |
