Using the information in Fig. 6.1, identify how many processes remove carbon dioxide from the atmosphere.
The boxes on the left contain letters for the processes in Fig. 6.1. The boxes on the right list the names of some processes. Link each letter to the correct process with a line. Draw four lines. Processes: combustion, decomposition, formation of fossil fuel, photosynthesis, respiration.
Draw an arrow on Fig. 6.1 to show herbivores feeding.
State the main source of energy in most food webs.
Explain why fossil fuels cannot be called a sustainable resource.
Deforestation can increase the carbon dioxide concentration in the atmosphere. State two other harmful effects of deforestation.
Adding extra carbon dioxide to the atmosphere causes an enhanced greenhouse effect. State the usual concentration of carbon dioxide in the atmosphere.
State one other pollutant that causes an enhanced greenhouse effect.