Today's limestone caverns were once solid rock. Acidic rainwater seeping through the rock over hundreds of years dissolved part of the rock,
forming caverns. This is an example of *
erosion
O deposition.
O physical weathering.
chemical weathering.

answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.

d. planting trees

the trees take in carbon to make oxygen.