Do these mean the same?
The valleys are shaped by three mountain ranges : the Alaska Range , the Chugach Mountains and the Talkeetna Mountains . The Matanuska-Susitna Valley was carved by glaciers
The valleys are shaped by three mountain ranges : the Alaska Range , the Chugach Mountains and the Talkeetna Mountains . The Matanuska-Susitna Valley has been carved by glaciers .

Available options:
(a). no
(b). yes
(b).