Underground limestone caves form a. from the cooling and solidification of magma below the surface. b. from the compacting and cementing of weathered rock fragments. c. when carbonic acid and carbon dioxide combine. d. when the calcite is dissolved by carbonic acid in rainwater.

The correct answer is option d. when the calcite is dissolved by carbonic acid in rainwater.

Caves are formed by the dissolution of limestone. What happens is that when rain water falls,, it carries carbon dioxide with it and pass through the soil and turn into weak acid.

This weak acid present in the soil dissolves limestone and forms beds of rock and planes that can even grow enough to form caves underground.

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.

the titanic would be the correct answer