15. (a)___Geysers_____________________ are intermittent hot springs or fountains inwhich columns of water are ejected with great force. When water in such featurescontains dissolved silica, then deposits of (b)___geyserite or siliceous sinter_____________________ form around them. When such features containdissolved calcium carbonate, then (d)_____calcareous tufa or travertine___________________or (e)________________________ is deposited.
16. Groundwater dissolution of limestone may produce spectacular cavities in the bedrockcalled __caverns or caves______________________.17. Dripstone features are collectively called (a)___speleothems_____________________. Theicicle-like dripstone formations are called (b)___stalactites_____________________. Dripstone
18. Landscapes that have been shaped chiefly by the dissolving power of groundwater aresaid to exhibit ___karst topography_____________________.19. Depressions caused by solution of bedrock and collapse of caverns arecalled (a)__sinkholes or sinks______________________ or (b)________________________.Applying What You Have Learned1. What is Darcy's law?