Explanation:

- Land Contamination: This occurs when harmful substances are present in the soil. These substances can affect plant growth and enter the food chain.

- Noise Pollution: This refers to excessive noise that affects environmental quality or health. It is usually unrelated to groundwater or any leaks into it.

- Water Pollution: Adulterated elements leaking into the ground and reaching groundwater is a classic case of water pollution. It affects the purity of water bodies and can harm ecosystems.

- Air Pollution: This involves harmful substances in the air. It doesn't directly relate to groundwater contamination.