___________________ _ are types of dripstone that hang from cave ceilings, while ___________________ _ form on the ground from calcite dripping onto the cave floor.
Fill in the blank(s) with correct word
Question 2
Most of the approximately 3,300 historic eruptions lasted ____.
A)a few days
B)from less than one month to six months
C)one to two years
D)more than two years
E)more than 20 years
