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Deep within the vast expanse of the Sahara Desert lies an enormous, circular formation spanning nearly 50 kilometers—an ...

At the top of the world, there is a sea—the remains of one, at least. The summit rocks of Mount Everest, the highest ...

The gigantic Yellowstone Grand Canyon, lined with volcanic rock. With all the effects of hydrothermal activity, river erosion and glacier activity this amazing formation was created ( Kiley Williams) ...

Telluride is a Cubist’s rendering of mountains. Overlapping triangles rim the horizon; the valley floor meets the box canyon walls at neat right angles; a few oval abstractions soften the ...

Thousands of hills and mounds on Mars have been found to contain layers of clay minerals ... and mesas in desert areas, where rock formations have been eroded by the wind for millions of years.

Mars, our neighboring red planet, possesses some of the most dazzling and extreme geological features within our solar system ...

To the south are ancient highlands, while to the north are eroded, mostly low-lying ... Immediately below the clay layers are older layers of rock that contain no clay; above the clay layers ...

Their erosion over hundreds of kilometers shows ... into the ancient geography and hydrology of Mars.” The clay-rich rock layers within the mounds suggest that an abundance of water was present ...