The role of episodic bombardment in geophysics

Details The role of episodic bombardment in geophysics The role of episodic bombardment in geophysics

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8220100c&link_type=abstract

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Physics

Geophysics

Asteroid Capture, Bombardment, Comets, Earth (Planet), Geophysics, Secular Variations, Atmospheric Boundary Layer, Collisions, Earth Core, Earth Mantle, Geomagnetism, Ice Formation, Plates (Tectonics), Spiral Galaxies

Scientific paper

The effects of cometary or asteroidal impacts on the boundary conditions at the core, outer mantle and atmosphere of the Earth are discussed through the literature. Impact episodes occur following the capture or orbital disturbance of these bodies as the solar system passes through the spiral arms of the galaxy. There is thus a tendency for magnetic field reversals, principal plate movements, ice ages and mass extinctions to be correlated and to recur on time scales dictated by galactic processes. Major geophysical phenomena can thus be synthesized in a purely astronomical theory. Knowledge of the continuous state of the galaxy then becomes a prerequisite for the understanding of terrestrial history.

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