• Deserts
• Rivers
• Lakes
• Springs
• Valleys
• Mountains
• Salt marsh
• Mud flats
• Sabkha
• Coral Reef
• Sandy shores
• Rocky shores

• Mammals
• Birds
• Reptiles
• Amphibians
• Fish
• Echinodormes
• Mollusc
• Insects
• Corals
• Sponge
• Worms

• Flowering plants
• Seagrass
• Algae

• Air pollution
• Water pollution
• Soil pollution
• Solid wastes