Weathering
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Weathering is the deterioration of rocks, soils and minerals through contact with water, atmospheric gases, sunlight, and biological organisms. It occurs in situ, and so is distinct from erosion, whic
A natural arch produced by erosion of differentially weathered rock in Jebel Kharaz (Jordan)
A rock in Abisko, Sweden, fractured along existing joints possibly by frost weathering or thermal stress
Exfoliated granite sheets in Texas, possibly caused by pressure release
Tafoni at Salt Point State Park, Sonoma County, California
Bauxite
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Bauxite is a sedimentary rock with a relatively high aluminium content. It is the world's main source of aluminium and gallium. Bauxite consists mostly of the aluminium minerals gibbsite, boehmite, an
Reddish-brown bauxite
Bauxite with US penny for comparison
Bauxite with core of unweathered rock
One of the world's largest bauxite mines in Weipa, in northern Queensland, Australia