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Transmission electron microscope (TEM) micrograph showing dark melanin granules in a melanocyte (top center) and in several keratinocytes, which, unlike melanocytes, have bundles of keratin filaments

Newspaper rock is a protected wall with ancient Anasazi Indian petroglyphs

Rural roads. Abstract background of liquefied earth surface.

Aerial view of canyons in Monument Valley, Arizona, USA.

Layered maroon and light speckled rock magnified.

This is a photograph of natural mineral formations at a geothermal site..Morocco South Africa,Nikon D3x

Stones texture nature background photo, High Resolution for 3D.

Coloured transmission electron micrograph (TEM) of a small arteriole showing, from lumen: endothelium (magenta), discontinuous internal elastic lamina (blue), cross-sectioned smooth muscle fibers (cytoplasm, red, nucleus, light yellow) and connective tissue of adventitia (green).

$Rudists embeded in sandstones, cross sections.\nCretaceous marine fossis near Barcelona.$

Sandstone wall, sandstone with artistic patterns hatching relief-like shapes on the surface, detail shot

Palo Duro Canyon State Park, Texas, USA: eroded cliff side - Geologic time periods marked by major changes in the fossil record - rock strata covering the Permian age, Triassic age, Miocene-Pliocene age and at the top the Quaternary age - this cliff includes the Permian-Triassic (P-T) extinction boundary, colloquially known as the Great Dying, that took place about 248 million years ago. The extinction was caused by climate change. The main cause of extinction was the vast amount of carbon dioxide emitted by volcanic eruptions that created the Siberian Traps, which elevated global temperatures and acidified the oceans. Geological time scale, part of the Caprock Escarpment - Texas Panhandle.

colored texture layers of the earth, full frame

Unique underground geology of stalactites and stalagmites.

$The Dead Sea and its predecessor lakes exhibit spectacular deformation patterns caused by earthquakes along the Dead Sea Fault. The photos exhibit various geological phenomena, including seasonal laminae layering (varves), folds, faults, fractures, dikes, soft sediment deformation, desert landscapes.$

$Wet rough asphalt black bitumen road pavement surface abstract grunge texture close-up top view background banner.\nBitumen is a sticky, black, highly viscous liquid or semi-solid form of petroleum. In the U.S., it is commonly referred to as asphalt. It may be found in natural deposits or may be a refined product, and is classed as a pitch. Before the 20th century, the term asphaltum was also used.\nTarmacadam is a road surfacing material made by combining crushed stone, sand, and tar. It is a more durable and dust-free enhancement of simple compacted stone macadam surfaces. The terms \$

Eroded sedimentary rocks of Cedar Breaks National Monument near Bryan Head Utah

Colours, textures and patterns on a natural stone. Stone background.

The Painted Hills are one of the three units that comprise the John Day Fossil Beds. Take time to also visit the Clarno Unit, with Mars-like pillars formed by waterfalls and volcanic sludge, and the Sheep Rock Unit, where fossils of plants and animals like saber-toothed cats are on display at the Thomas Condon Paleontology Center. The hills get their name from the delicately colored stratifications in the soil and the yellows, golds, blacks and reds of the Painted Hills are best seen in the late afternoon. Tones and hue may appear to change from one visit to another, as the claystone differ with ever-changing light and moisture levels. Once you see them for yourself, it’s pretty easy to understand why the Painted Hills are one of the 7 Wonders of Oregon.

Gloss mountains national park or glass mountains, Oklahoma

$False colour TEM micrograph. Olfactory nerve showing the ensheathing glia (nucleus, blue, cytoplasm green, basal lamina, pink) surrounding many non-myelinated axons (brown) of olfactory neurons.\$

Summer landscape in Badlands National Park, South Dakota, USA

Free Images: "bestof:Helsby Sandstone.png en Photomicrograph image of a sample from the Helsby Sandstone Formation Runcorn UK a middle Triassic sandstone Pore space dyed blue Quartz"

Sandstone Layers in Antelope Slot Canyon Arizona USA.jpg

Checkerboad mesa Zion sandstone strata.jpg

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sandstone-landscape-in-Red-Rock-Canyon-National-Conservation-Area.jpg