Scree, <b>which</b> abounds in the Rocky Mountains, has its origins in the ice ages.<br/><br/>-&gt; Scree, abounding in the Rocky Mountains, has its origins in the ice ages.<br/><br/>-&gt; Abounding in the Rocky Mountains, Scree has its origins in the ice ages.<br/><br/>My grammar book says all of them are the same in meaning. What do you think? Do I have to throw it away?<img class='emoticon' style='Width:19px;Height:19px;' data-delaysrc='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/9.gif' src='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/9.gif' alt='Emotion: crying'/>