'From the German for rivulet <a href="http://www.j-archive.com/media/2007-09-10_DJ_20.jpg" target="_blank">these trenches</a> on the moon's surface probably carried lava'
rills
MOON Rs: From the German for rivulet these trenches on the moons surface probably carried lava
From the German for rivulet these trenches on the moon's surface probably carried lava
From the German for rivulet these trenches on the moon's surface probably carried lava
MOON "R"s
rills
MOON "R"s