Answer:
1. Water, 2. Acid precipitation, 3. Oxygen, 4. Carbon dioxide.
Explanation:
- The impact of water in the limestone caves creates the formation of limestone or cave topography that is based on the development of pillars, columns, and the stalactites and stalagmites.
- Acid rain is harmful to both the plants and animals, also depletes the soil microbes.
- Oxygen in the air can react with minerals to form compounds of oxides.
- Carbon dioxide is an important greenhouse gas that is associated with the process of weathering and hence breaks molecules into smaller molecules.
