Carbon dioxide exists naturally in air and is produced by burning or rotting organic matter. In animals, the body's metabolism makes the tissues burn carbon, which is then exhaled by the lungs as waste carbon dioxide. Carbon dioxide is removed from the atmosphere by plants when it is split by chlorophyll in photosynthesis to form carbon and oxygen. It is also dissolved from the atmosphere in sea water. The increasing release of carbon dioxide into the atmosphere, especially from burning fossil fuels, contributes to the greenhouse effect. Carbon dioxide is used in solid form as a means of keeping food cold. It is also used in carbonated drinks and as a coolant in some nuclear reactors. |
Fresh water. Solo 11% degli utenti ha risposto correttamente |
Risposta tratta da : Lingua inglese Ministero dell'Interno Quiz - Concorso per 250 funzionari amministrativi a tempo indeterminato, da destinare esclusivamente alle Commissioni territoriali per il riconoscimento della protezione internazionale ed alla Commissione nazionale per il diritto d'asilo |
di seguito le risposte errate:
Sweet water.
Blue water.
Clear water.