This image from NASA 2001 Mars Odyssey spacecraft shows a very small portion of the lava flows that originated from Arsia Mons -- a pre-existing crater has been filled, with only small sections of its rim still visible above the level of the lava.
This image from NASA 2001 Mars Odyssey spacecraft shows a very small portion of the lava flows that originated from Arsia Mons -- a pre-existing crater has been filled, with only small sections of its rim still visible above the level of the lava.