sedimentary rocks

More than 6,000 rare and precious specimens such as biological bones and sedimentary rocks were first announced after marine exploration and research.

In the video, Scott C. Waring, the editor of this page, points out that a smooth, round gray sphere sits between the rocks on the surface of Mars.

Scientists have recently found traces of bacteria 3.5 billion years ago, in a layer of sedimentary rock in Australia.