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radial drainage

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centripetal drainage pattern

Overview page. Subjects: Environmental Science.

A drainage pattern that is the opposite of a radial drainage pattern, in which the rivers drain in towards the centre of a basin, like the spokes of a wheel.

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Cnidaria

Overview page. Subjects: Biological Sciences.

A phylum that comprises the sea anemones, jellyfish, and corals, and which is known from the late Precambrian. Cnidarians are basically radially symmetrical and have tentacles. The body...

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Cystoidea

Overview page. Subjects: Earth Sciences and Geography.

(subphylum Blastozoa, phylum Echinodermata)

Extinct group of echinoderms, ranking in some classification schemes as a class or superclass, and ranging from the Lower Ordovician to...

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drainage pattern

Overview page. Subjects: Earth Sciences and Geography.

The spatial relationship between individual stream courses in an area. The resulting pattern often reflects the underlying rock type and structure, and several varieties are recognized. A...

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dyke swarm

Overview page. Subjects: Earth Sciences and Geography.

A collection of many subvertical radial dykes around a central intrusion; or many parallel to subparallel dykes occurring over a large regional area (dyke set).

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Eocrinoidea

Overview page. Subjects: Earth Sciences and Geography.

(subphylum Blastozoa)

Extinct class of cystoid-like echinoderms, with radial symmetry, which range in age from Lower Cambrian to Middle Silurian (Lower Palaeozoic). Their globular...

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irregular echinoids

Overview page. Subjects: Earth Sciences and Geography.

Echinoids (Echinoidea) in which a bilateral symmetry is superimposed on the radial symmetry and where the apical system no longer contains the periproct. In some groups, e.g. the...

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