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"The abundant concretions found in the Navajo Sandstone consist of sandstone cemented together by hematite (Fe2O3), and goethite (FeOOH). The iron forming these concretions came from the breakdown of iron-bearing silicate minerals by weathering to form iron oxide coatings on other grains." en.wikipedia.org/wiki/Navajo_Sandstone#Iron_oxide_concret...

Moqui Marbles, Utah Iron Oxide concretions (Moqui Marbles) Moqui Marbles, Hematite Concretions, from the Navajo Sandstone of Southeast Utah. The Navajo Sandstone is also well known among rockhounds for its hundreds of thousands of Iron Oxide concretions

Ol Doinyo Lengai, Tanzania. The only active carbonatite volcano in the world. Its lava erupts at only 500 degrees C.

Weirdest volcano in the world. The only active carbonatite volcano in the world. Its lava erupts at only 500 degrees C.

tropischer Sturm "Talim" in der Stadt Wenzhou in der ostchinesischen Provinz Zhejiang

A road is engulfed by water and rocks after a landslide on June 2012 in Wenzhou, China. Heavy rainstorms hit east China's Zhejiang province on Monday, causing flooding in low-lying areas across the region.

Imagen de http://www.turismoenfotos.com/archivos/temp/5633/1280_1290707537_volcan-mauno-loa-hawai.jpg.

Document and explore hazardous regions of Earth without human lives at risk using the self-driving car.

Torres del Paine National Park

Torres del Paine National Park, Patagonia, Chile Beautiful, but be prepared for crazy weather - Ariel

Aerial photo of part of 800 mile long San Andreas Fault, San Luis Obispo County, California, CA United States

Aerial photo of part of 800 mile long San Andreas Fault, San Luis Obispo County, California, CA United States

“ Rivers of lava from erupting volcano Plosky Tolbachik, Kamchatka | Russia by Anton Agarkov ”

Rivers of lava from erupting volcano Plosky Tolbachik, Kamchatka, Russia by Anton Agarkov

What Is the Rock Cycle? Here are two short videos, a chart of some pretty rocks, & an online quiz. The quiz is aligned with the video. #geology #science #rocks

What Is the Rock Cycle? Here are two short videos, a chart of some pretty rocks, & an online quiz. The quiz is aligned with the video.

Road blocked by cooled lava in Hawaii Volcanoes National Park  Google Image Result for http://traveltips.usatoday.com/DM-Resize/photos.demandstudios.com/getty/article/76/114/200366460-001.jpg%3Fw%3D600%26h%3D600%26keep_ratio%3D1

Volcano Hiking Tours in Hawaii

Road blocked by cooled lava in Hawaii Volcanoes National Park - The Hawaiian islands are home to one of most active volcanic areas on our planet!

The boundary between the Eurasian and American plates, Iceland ... Photo by PierreG_09 on Flickr

épinglé par ❃❀CM❁✿⊱The boundary between the Eurasian and American plates, Iceland

Air bubbles trapped in 2.7 billion-year-old lava flows in the Pilbara suggest the Earth's atmosphere was far thinner than previously thought.

AU: Air bubbles trapped in Ba-old lava flows in the Pilbara suggest the Earth's atmosphere was far thinner than previously thought

Hawaii Volcanoes National Park: Lava

Hawaii Volcanoes National Park: Lava

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