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Chernozem (/ ˈ tʃ ɜːr n ə z ɛ m / CHUR-nə-zem), [a] also called black soil, regur soil or black cotton soil, is a black-colored soil containing a high percentage of humus [3] (4% to 16%) and high percentages of phosphorus and ammonia compounds. [4]
This order meant that the minerals that crystallized first from the melt were the least stable under earth surface conditions, while the minerals that crystallized last were the most stable. This is not the only control on weathering rate; this rate is dependent on both intrinsic (qualities specific to the minerals) and extrinsic (qualities ...
Aphanitic (a = not, phaner = visible) rocks, in contrast to phaneritic rocks, typically form from lava which crystallize rapidly on or near Earth's surface. When extrusive rocks make contact with the atmosphere they cool quickly, so the minerals do not have time to form large crystals. The individual crystals in an aphanitic igneous rock are ...
The route leaves Union City and heads through farm fields and woods, reaching a junction with PA 89 to the north of the borough of Elgin. Here, PA 89 forms a concurrency with US 6 before splitting to the south. The route runs east-northeast through wooded areas with some development prior to entering the city of Corry.
Heading east from Bishop, California. The modern US 6 in California is a short, two-lane, north–south surface highway from Bishop to the Nevada state line. Prior to the 1964 state highway renumbering, US 6 extended to Long Beach along what is now US 395, State Route 14 (SR 14), Interstate 5 (I-5), I-110/SR 110, and SR 1.
Archaeologists have unearthed strange alien-looking statues with elongated heads from over 7,000 years ago in Kuwait, shedding more light on the origin and evolution of one of the oldest ...
From planetary meet-ups to the first total lunar eclipse in three years, here are the top astronomy events to look for throughout 2025: Stellar views of Mars will greet stargazers in January as ...
In January 2020, cosmochemists reported that the oldest material found on Earth to date are the silicon carbide particles from the Murchison meteorite, which have been determined to be 7 billion years old, about 2.5 billion years older than the 4.54-billion-year age of the Earth and the Solar System.