What is the main difference between a sinkhole and a cavern?

Caverns are due to chemical weathering and are empty spaces.
Sinkholes are due to chemical weathering and are empty spaces.
Caverns are due to physical weathering and are circular depressions.
Caverns occur when the roofs of sinkholes collapse.

Which of the following does not determine the type of magma to erupt from a volcano? a. temperature b. gas content c. viscosity d. silica content what kind of volcano forms from basaltic magma with low-viscosity and low-gas content? a. shield volcano b. stratovolcano c. composite-cone volcano d. cinder-cone volcano what is viscosity? a. a rising mass of mantle abnormally hot and / or wet b. a pool of magma beneath the overlying crust c. what causes a bend to occur in the rock layer d. a measure of a fluid's resistance to flow