Martian lava tubes
... that 7th-grade science students at Evergreen Middle School in Cottonwood, California, helped researchers discover a new series of Martian lava tubes ?
... that 7th-grade science students at Evergreen Middle School in Cottonwood, California, helped researchers discover a new series of <b id="mwB6k"><a class="mw-redirect" href="./Martian_lava_tubes" id="mwB6o" rel="mw:WikiLink" title="Martian lava tubes">Martian lava tubes</a></b> <i id="mwB6s">(pictured)</i>?