Geology√

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Geology√

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Geology√

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Geology√

1974 Archival description results for Geology√

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Cornwallis Gr. Looking south from station 63 K 4

Cornwallis Gr. Looking south from station 63 K 4 toward Griffith Island in distance. Beds in foreground are Ordivician-Silurian. Allen Bay formation, dipping at 19 degrees to NE (left in photo). Station 63 K 4.

Coral reefs

Coral reefs. Shift in coral reef belts on earth throughout time (Scwartbach, 1961, p. 412)

Convection currents within earth's mantle

Convection currents within earth's mantle are basis for a theory of the origin of the mid-ocean ridge and rift. As seen here, the currents flow up under the rift, push out new material, lover laterally under continents and compress them, making mountains rise up. Heezen, 1960.

Convection currents

Convection currents. Continental mountain chains and island arcs could form where currents sink and meet. Mid-ocean ridges where they rise and blocks are torn apart. Arrows indicate directions of horizontal flow of currents at present. Broken lines are faults (J.T. Wilson, 1963, Sci. Amer.)

Contrasted slope profiles

Contrasted slope profiles. Widening of valleys and change of slope profile during the cycle of erosion. Right, youth to old age according to W.M. Davis. Left, with parallel scarp retreat, according to W. Penck. (From Davis, 1930). King, 1953.

Contracting earth

Contracting earth. Cross section of the earth, illustrating areas of compression and tension and the level of no strain. Jacobs et al., 1959, p. 353.

Results 1576 to 1590 of 1974

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