| 11. | When material slides into the void, a pit crater or a pit crater chain forms.
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| 12. | The cone collapsed into a pit crater 1, 000 feet ( 300 meters ) deep.
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| 13. | This crater and the next, a dirt pit crater, Kookoolau, give no idications of recent eruptions.
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| 14. | Fossae / pit craters are common near volcanoes in the Tharsis and Elysium system of volcanoes.
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| 15. | In addition, the central peaks of many large craters on Mars have pit craters at their summits.
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| 16. | Pit craters are not common on Earth.
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| 17. | Other interesting features are lava channels, Dark slope streaks, pit crater chains, and large troughs ( called fossae ).
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| 18. | On Mars, individual pit craters can join to form chains or even to form troughs that are sometimes scalloped.
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| 19. | Unlike impact craters, pit craters are rimless, often irregularly shaped, steep-sided, and often display no associated ejecta or lava flows.
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| 20. | It has drawn scientific attention because of the large, arc-shaped pit crater located on the eastern side of its floor.
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