loomed appeared dimly or vaguely as a large, threatening shape
rille a long, narrow valley on the surface of the moon
runt animal, person, ofr plant that is smaller than the usual size. If used about a person, runt is sometimes considered offensive.
staggered moved or walked unsteadily; weary
summoning stirring to action; rousing
taunted jeered at; mocked; reproached
trench any ditch; deep furrow
trudged walked wearily or with effort
While daring each other to jump over rilles, or narrow valleys on the Moon, Gerry and Vern get into trouble. Vern falls and hurts his knee while also knocking his battery, which gives him air to breathe in his spacesuit, loose. Luckily, the boys are able to get to a nearby shelter wehre Vern is out of danger.