Which process causes the formation of underground tunnels and caverns? melting of glaciers exposure of coral reefs overflowing of rivers and lakes dissolution of limestone bedrock

Which are practical examples of how people in the developed world could make a big difference in how much water they use check all that apply a. use lightbulbs that use less electricity b. consider using a composting toilet that does not use water c. avoid using your telephone during peak hours d. do not read books