'Olympus Mons, one of these lava-spewing openings in Mars' surface, is over 16 miles high'
volcano
MARS: Olympus Mons, one of these lava-spewing openings in Mars' surface, is over 16 miles high
Olympus Mons, one of these lava-spewing openings in Mars' surface, is over 16 miles high
Olympus Mons, one of these lava-spewing openings in Mars' surface, is over 16 miles high
MARS
volcano
MARS