它们的缺失使寒冷、干燥的火星经历了从未经历过形成湖泊和海洋所需的延长温和期的景象。
Their absence supports the picture of a cold, dry Mars that never experienced the extended mild period required to form lakes and oceans.
许多火山被保护起来成为公园，有些则作为不开发的非居住区，例如作为球场，因此这些被植被覆盖的绿色圆形高地与周围灰白色的城市景象形成鲜明对比。
Many of them have been protected as parks or non-residential development, such as ball fields, and so they stand out as green circles of vegetation against the surrounding gray and white cityscape.
图像展示了盐田东部边缘的景象；东面的地面海拔略有升高，布满了典型的干涸河床形成的网状纹样。
The image shows the eastern edge of the saltpan; the land to the east has a slightly higher elevation and consists of a network of typically dry river channels.
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