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alkene
(Encyclopedia) CE5 Alkenes alkene ălˈkēn [key], any of a group of aliphatic hydrocarbons whose molecules contain one or more carbon-carbon double bonds (see chemical bond). Alkenes with only one double bond h...Triassic period
(Encyclopedia)Triassic period trīăsˈĭk [key], first period of the Mesozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table) from 205 to 250 million years ago. Throughout the Triassi...New Siberian Islands
(Encyclopedia)New Siberian Islands, Rus. Novosibirskiye Ostrova, archipelago, c.10,900 sq mi (28,200 sq km), N Siberian Russia, in the Arctic Ocean between the Laptev and East Siberian seas, part of the Sakha Repub...sea lily
(Encyclopedia)sea lily, stalked echinoderm of the class Crinoidea. Sea lilies are ancient, having reached their peak in the Middle Mississippian period; about 5,000 fossil species are known. About 80 modern species...Guadalupe Mountains National Park
(Encyclopedia)Guadalupe Mountains National Park gwäˈdəlo͞op [key], 86,416 acres (34,998 hectares), W Tex. Located in the Guadalupe Mts., the park contains parts of the world's largest and most significant Permi...Velociraptor
(Encyclopedia)Velociraptor vəlŏsˈĭrăpˌtər [key] [Gr.,=swift robber], swift bipedal carnivorous dinosaur of the late Cretaceous period. It was relatively small, being approximately 6 ft (1.8 m) long. It was s...pimple
(Encyclopedia)pimple, small pointed elevation of the skin that may or may not contain pus. The formation of pimples is frequently associated with infection, irritation, or overactivity of the sebaceous and sweat gl...Broecker, Wallace Smith
(Encyclopedia)Broecker, Wallace Smith brōkˈər [key], 1931–2019, American geophysicist, b. Chicago, Ph.D. Columbia, 1958. He was a member of Columbia's faculty from 1959. In the 1970s he predicted rising temper...turkey , in zoology
(Encyclopedia)turkey, common name for a large game and poultry bird related to the grouse and the pheasant. Its name derives from its “turk-turk” call. Turkeys are indigenous to the New World; American fossils ...Deinonychus
(Encyclopedia)Deinonychus dīˌnənīˈkəs [key] [Gr.,=terrible claw], swift bipedal carnivorous dinosaur of the early Cretaceous period, approximately 119–93 million years ago. Fossil specimens have been discov...Browse by Subject
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