In some places, where groundwater has dissolved limestone to form caverns and large openings, its rate of flow can be relatively fast but this is exceptional.
(its rate of flow; can be; relatively fast; L:In some places) (this; is; exceptional) (groundwater; has dissolved; limestone; to form caverns and large openings; L:some places) Context(groundwater has dissolved,List([22, 47))):(groundwater; has dissolved limestone to form; caverns and large openings)
groundwater has dissolved,List([22, 47))
its rate of flow this groundwater groundwater
can be is has dissolved has dissolved limestone to form
relatively fast L:In some places
exceptional
limestone to form caverns and large openings L:some places
caverns and large openings