Large central peaks and the abundance of pit craters probably indicate the presence of near-surface ice at the time of impact.
22.
Observations in the walls of the pit craters indicate that there have been several episodes of cone and pit crater formation.
23.
The eruption started as a fissure between two pit craters, loi and Alae, where the Mauna Ulu shield would eventually form.
24.
Observations in the walls of the pit craters indicate that there have been several episodes of cone and pit crater formation.
25.
A small observing station was set up on the rim of Halemaumau crater ( a pit crater within Kilauea's summit caldera ).
26.
Sinkholes, where the ground falls into a hole ( sometimes in the middle of a town ) resemble pit craters on Mars.
27.
A newly formed pit crater has steep overhanging sides and is shaped like a cone inside, growing wider closer to the bottom.
28.
"' Crater Rings "'are adjacent, symmetrical volcanic pit craters in the Western Snake River Plain about 8 miles northwest of Mountain Home, Idaho.
29.
Chains of pit craters located throughout the Ganiki Planitia Quadrangle have been found to influence the formation and deformation of these extensional features.
30.
Central pit craters are rare on the Moon but are very common on Mars and the icy satellites of the outer Solar System.
