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Topics related to "Occurrence and genesis of thunder eggs containing plume and moss agate from"

agate agate
agate , translucent, cryptocrystalline variety of quartz and a subvariety of chalcedony . Agates are identical in chemical structure to jasper, flint, chert, petrified wood, and tiger's-eye, and are often found in association with opal. The colorful, banded rocks are used as a semiprecious... Read more
gametophyte gametophyte
gametophyte , phase of plant life cycles in which the gametes, i.e., egg and sperm, are produced. The gametophyte is haploid, that is, each cell contains a single complete set of chromosomes, and arises from the germination of a haploid spore. In many lower plants, the gametophyte phase is the... Read more
plume plume
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onyx onyx
onyx , variety of cryptocrystalline quartz , differing from agate only in that the bands of which it is composed are parallel and regular. Its appearance is most striking when the bands are of sharply contrasting colors; black and white specimens are often used for cameos. Onyx was used in Roman... Read more
fraternal twins fraternal twins
fraternal twins (dizygotic twins) Two individuals that result from a single pregnancy, each having developed from a separate fertilized egg. The two egg cells contain different combinations of alleles and so do the two sperm that fertilize them. The twins therefore have no more genetic similarity... Read more
occurrence occurrence
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thunder thunder
thunder sound produced along a path of a lightning flash, caused by the rapid heating and expansion of the adjacent air. Rolling thunder occurs either as a result of the time difference between sounds from the far and near end of a flash, or when mountains, layers of air, or other obstructions... Read more
quetzal quetzal
quetzal or quezal , common name for a magnificent bird of the family Trogonidae ( trogon family), found in the rain forests from S Mexico to Costa Rica at altitudes of up to 9,000 ft (2,745 m). It is strikingly beautiful, with a crested head, bronze-green back, and crimson and white underparts.... Read more
James Evershed Agate James Evershed Agate
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Thundering Legion Thundering Legion
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