Mathematics – Logic
Scientific paper
Jul 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974plug.nasa..137g&link_type=abstract
In its A Primer in Lunar Geology p 137-175 (SEE N75-13730 04-91)
Mathematics
Logic
15
Impact Loads, Lunar Craters, Lunar Evolution, Meteorite Craters, Hypervelocity Impact, Lunar Geology, Lunar Surface, Lunar Topography, Solar System
Scientific paper
This presentation illustrates that commencing in time from the initial stages of the condensation of solids from the solar nebula and their subsequent accretion into planetary objects, collisions between the condensates have played a primary role in planetary evolution in general and for the moon in particular. Principal emphasis is focused on collisions in an excavation mode; i.e., impact cratering which represents a geologic agent for: (1) Major landforms and stratigraphic units; (2) metamorphism; (3) comminution; (4) erosion, transport, and sedimentation; and (5) formation and mixing of the lunar regolith. Because an appreciation of the physics of stress waves and cratering mechanics is essential to understanding of impact processes as a geologic agent, some basic properties of stress waves with specific applications to geologic aspects and to cratering mechanics are elaborated. Lunar cratering is then considered starting from an evaluation of sources for the impacting bodies and particles, and leading into the subject of the long term (geologic) effects of impact cratering. Finally, the importance of the historical record of cratering appearing on the lunar surface is reviewed in regard to the implications to the evolution of the planets and the early history of the solar system.
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