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Because ordinary chondrites represent 80% of the meteorites that fall to earth, and because ordinary chondrites contain 60–80% chondrules, it follows that (excluding dust) most of the meteoritic material that falls on earth is made up of chondrules. Chondrules can range in diameter from just a few micrometers to over 1 centimetre (0.39 in).
The Sutter's Mill meteorite is a carbonaceous chondrite which entered the Earth's atmosphere and broke up at about 07:51 Pacific Time on April 22, 2012, with fragments landing in the United States. [ 6 ] [ 7 ] The name comes from Sutter's Mill , a California Gold Rush site, near which some pieces were recovered.
Ordinary chondrites are by far the most common type of meteorite to fall to Earth: about 80% of all meteorites and over 90% of chondrites are ordinary chondrites. [11] They contain abundant chondrules, sparse matrix (10–15% of the rock), few refractory inclusions, and variable amounts of Fe–Ni metal and troilite (FeS). Their chondrules are ...
Chondrule glass: Altered or absent: Mostly altered, some preserved: Clear, isotropic: Devitrified: Absent Metal: Maximum Ni content – <20% Taenite minor or absent >20% kamacite and taenite in exsolution relationship Sulfides: Mean Ni content – >0.5% <0.5% Overall Texture: No chondrules: Sharp chondrule boundaries: Some chondrules can be ...
The 1990 Earth Day demonstration included efforts from about 200 million people in 141 countries, according to the Earth Day Network. Earth Day has inspired countries to start environmentally ...
Enstatite chondrites (E-type chondrites) are a rare form of meteorite, rich in the mineral enstatite.Only about 200 E-Type chondrites are currently [when?] known, [1] comprising about 2% of the chondrites that fall on Earth. [1]
A college student in a gas mask "smells" a magnolia blossom during the first Earth Day on April 22, 1970 in New York City. Credit - AP. M ore than 8 billion people inhabit Earth, and soon a ...
However, most LL chondrites have been thermally metamorphosed to petrologic types 5 and 6, meaning that their minerals are homogeneous in composition and chondrule borders are difficult to discern. This, together with the low content of metal, led the 19th century mineralogist Tschermak to determine that they formed a transitional stage between ...