Sea urchins erode rock reefs, excavate pits for themselves

Through their grazing activity, sea urchins excavate rock and form the pits they occupy. This activity may cause significant bioerosion of temperate reefs, according to a study published February 21, 2018 in the open-access ...

NASA image: Reading the alphabet from space

NASA's Earth Observatory has tracked down images resembling all 26 letters of the English alphabet using only NASA satellite imagery and astronaut photography. In this image, the letter 'Y' is for yardangs, elongated landforms ...

Mars panorama from Curiosity shows petrified sand dunes

Some of the dark sandstone in an area being explored by NASA's Curiosity Mars rover shows texture and inclined bedding structures characteristic of deposits that formed as sand dunes, then were cemented into rock.

Professor discovers new lichen species in city of Boulder

A University of Colorado Boulder scientist unexpectedly discovered two lichen species new to science in the same week while conducting research in Boulder Colorado, near the city's eastern limits.

Image: Curiosity Mars rover beside sandstone target 'Windjana'

(Phys.org) —This image from the Navigation Camera (Navcam) on NASA's Curiosity Mars rover shows a sandstone slab on which the rover team has selected a target, "Windjana," for close-up examination and possible drilling. ...

Curiosity Mars rover finds sandstone variations

(Phys.org) —Variations in the stuff that cements grains together in sandstone have shaped the landscape surrounding NASA's Curiosity Mars rover and could be a study topic at the mission's next science waypoint.

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