Today's Word of the Day means...
An elongated opening in a volcano through which magma reaches the Earth's surface.
A stack of minerals that have precipitated out of a hydrothermal vent on the floor of a sea or ocean. See more at hydrothermal vent.
An isolated column of rock along a coastline, formed by the erosion of a sea cliff by waves. Chimneys are smaller than stacks.
structure designed to carry off smoke from a fireplace or furnace. A chimney also induces and maintains a draft that provides air to the fire