Glossary term: 环形山
Description: 环形山是固体行星、月球或其他太空小天体表面的圆形凹陷。有些环形山是火山形成的，尤其是在地球和金星上，但大多数环形山是撞击坑，是由大型太空岩石或彗核撞击造成的。地球表面有几十个撞击坑，月球上有几千个。月球上巨大的、颜色较深的圆形地貌 “玛丽亚"就是巨大的撞击坑，形成于数十亿年前，然后被熔岩填满，之后凝固。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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