The opening or crack in a cave is commonly referred to as a "cave entrance." This entrance can vary in size and shape, allowing access to the interior of the cave. Depending on its geological formation, it may also be called a "sinkhole" or "cavern entrance." Such openings play a crucial role in the cave's ecosystem and airflow.
An entrance to a cave is called a cave mouth or cave opening.
That is a "cave."
The top of a cave is called the entrance or the mouth of the cave. It is the opening through which one can access the interior of the cave.
The opening is called the cave entrance or cave mouth. It is usually an "exit" formed by flowing water.
A cave?
An opening in a wall is typically called a doorway or an entrance. It can also be referred to as a portal or an aperture.
A light shining through a crack is called a beam of light. It can produce a visible streak or column of light that passes through the opening.
he dreamed that a crack was forming in the cave (which there was)
It is called weathering.
the island cave is on route 105.
crack!
A crevice is smaller than a cave. I would go with "black crack."