Pit Crater Chains
Pit craters are common near volcanoes in the Tharsis and Elysium system of volcanoes. Pit craters form when a void is produced by a cracking of the surface caused by stretching. Also, lava may drain out of an underground chamber, thus leaving an empty space. When material slides into a void, a pit crater or a pit crater chain forms. Pit craters do not have rims or ejecta around them, like impact craters do. On Mars, individual pit craters can join to form chains or even to form troughs that are sometimes scalloped. Pit craters are not common on Earth. Sinkholes, where the ground falls into a hole (sometimes in the middle of a town) resemble pit craters on Mars. However, on the Earth these holes are caused by limestone being dissolved thereby causing a void. The image below of Arsia Chasmata contains a pit crater chain.
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Arsia Chasmata, as seen by HiRISE. A pit crater chain is visible in the lower right.
Read more about this topic: Phoenicis Lacus Quadrangle
Famous quotes containing the words pit, crater and/or chains:
“The great snake lies ever half awake, at the bottom of the pit of the world, curled
In folds of himself until he awakens in hunger and moving his head to right and to left prepares for his hour to devour.”
—T.S. (Thomas Stearns)
“Give me a condor’s quill! Give me Vesuvius’ crater for an inkstand!”
—Herman Melville (1819–1891)
“Let the saints be joyful in glory: let them sing aloud upon their beds. Let the high praises of God be in their mouth, and a two-edged sword in their hand; to execute vengeance upon the heathen, and punishments upon the people; to bind their kings with chains and their nobles with fetters of iron; to execute upon them the judgment written.”
—Bible: Hebrew Psalms 149:5-9.