This usually
means a very
big and dark hole
inside a mountain
or under the ground.

This is the name
of the world we
are currently
on right now.

This is the door
you use to
leave a building
or a room.

This is like a
mountain but a
lot smaller.

This is like sea
but much bigger
and there are
only five of
these on Earth.

This is smaller
than a lake and
you can usually
find ducks and
frogs here.

This is like a
very small rock
that you can
even throw.

This is what you
can see out of
a window, or
from a balcony.