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Thermal stress weathering is an important mechanism in deserts, where there is a large diurnal temperature range, hot in the day and cold at night. [14] As a result, thermal stress weathering is sometimes called insolation weathering, but this is misleading. Thermal stress weathering can be caused by any large change of temperature, and not ...
The visual and infrared photos show effects of pollution from their respective areas over the entire earth. Aircraft and rocket pollution, as well as condensation trails, can also be spotted. The ocean current and low level wind information gleaned from the space photos can help predict oceanic oil spill coverage and movement.
Meteorite weathering is the terrestrial alteration of a meteorite. Most meteorites date from the oldest times in the Solar System and are by far the oldest material available on our planet. Despite their age, they are vulnerable to the terrestrial environment.
The top images are in plane-polarized light; the bottom images are in cross-polarized light. Cements fill the pore spaces. Cements fill the pore spaces. Closeup of Pharaoh Menkaure 's greywacke statue, 25th century BCE, from the Egyptian Museum in Cairo
Many explanations have been proposed for honeycomb and other cavernous weathering. These explanations include marine abrasion; wind corrosion; mechanical weathering resulting from short-term temperature variations; chemical weathering of the interior of the rock (core-softening) under a protective crust (case-hardening) followed by mechanical removal of the softened material; biogeochemical ...
Image credits: Old-time Photos To learn more about the fascinating world of photography from the past, we got in touch with Ed Padmore, founder of Vintage Photo Lab.Ed was kind enough to have a ...
Spheroidal or woolsack weathering in granite on Haytor, Dartmoor, England Spheroidal weathering in granite, Estaca de Bares, A Coruña, Galicia, Spain Woolsack weathering in sandstone at the Externsteine rocks, Teutoburg Forest, Germany Corestones near Musina, South Africa that were created by spherodial weathering and exposed by the removal of surrounding saprolite by erosion.
When exposed to air, silicate rocks undergo weathering reactions which remove carbon dioxide from the atmosphere. These reactions proceed in the general form Rock-forming mineral + CO 2 + H 2 O → cations + bicarbonate + SiO 2. An example of such a reaction is the weathering of wollastonite: CaSiO 3 + 2 CO 2 + H 2 O → Ca 2+ + SiO 2 + 2 HCO − 3