remote sensing
... that remote sensing helps geologists study otherwise inaccessible areas such as Antarctic ice shelves?
... that <b id="mwBKw"><a class="mw-redirect" href="./Remote_sensing_(geology)" id="mwBK0" rel="mw:WikiLink" title="Remote sensing (geology)">remote sensing</a></b> helps geologists study otherwise inaccessible areas such as Antarctic ice shelves?