99. caverns—a
large cave formed by groundwater dissolving
limestone
100. caves—an
empty place under the ground, often with an opening in the side of a hill
101. pillar—the
joining of a stalactite and a stalagmite
102. igneous—rocks
that formed when magma or melted rock
from deep inside the earth rises and cools
103. limestone—sedimentary
rock where most caves are formed
104. metamorphic—rocks
that change due to heat and pressure
105. sedimentary—pieces
of sand, clay and dirt that are pressed together to form layered rocks
106. spelunking—exploring
and/or mapping a cave
107. stalactites—mineral
growths that form on the ceilings of caves
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