Fissures (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fissures</span>' is the definition.<br/ ><span class="explanation-format__explanation">(rift is a kind of fissure)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rifts that I've seen before include "Clefts in earth, or disagreements" , "Breaks, severances" , "Splits" , "Deep divides" , "Schisms" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fissures</span>' is the definition.<br/ ><span class="explanation-format__explanation">('crevice' can be a synonym of 'fissure')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Another definition for crevices that I've seen is " Long narrow cracks or fissures".)