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

Hey the process causes the formation of underground tunnels and caverns is Dissolution of limestone bedrock. (D.) Hope this helps!

Mexico has a host of environmental problems, including significant chemicalpollution  from factory discharges and waste dumping, but the main threat to itsbiodiversity  probably stems from  deforestation  and other natural habitat losses. forest habitat is lost for a number of reasons

The correct answer is a)  a resource with a limited supply; it will run out.