Excessive sand mining can lead to:

Loss of biodiversity is the decrease in the variety of life on Earth. Sand mining can contribute to loss of biodiversity by destroying habitats and ecosystems.

For example, sand mining can destroy coral reefs, which are important ecosystems that provide food and shelter for many marine animals. Sand mining can also destroy mangrove forests, which are important ecosystems that protect coastlines from erosion and provide habitat for many marine animals.

In conclusion, excessive sand mining can have a number of negative environmental impacts, including coastal erosion, water table depletion, and loss of biodiversity.