Impact hypothesis

Case 2 The relocation of dredged material of toxicity classes III and IV must be decided on a case-by-case basis. An impact hypothesis (prediction of potential impacts) is mandatory. 

Assessment endpoint Impact hypothesis Measurement endpoints... 

Ringwood, A. E., Kato, T., Hibbeson, W. Ware, N. (1991) Partitioning of Cr, V, and Mn between mantles and cores of differentiated planetesimals Implications for giant impact hypothesis of lunar origin. Icarus, 89,122-8. 

A semi-quantitative asteroid impact hypothesis of tektite origin. J. Geophys. Res. 66, 2521 (1961). 

Asteroid- or Comet-Impact Hypothesis of Tektite Origin. In Tektites, J. A. O Keefe, Ed. Chicago, 1963. 

The standard model for the formation of the Moon is the Giant Impact hypothesis (Stevenson, 1987). This model proposes that a planetesimal, the mass of Mars (about 15% the mass of the Earth), collided with the proto-Earth, at a time after core formation. The impact generated a huge amount of thermal energy so that the impactor and part of the Earth were vaporized, and some of this material coalesced... 

The likely implications of the Giant Impact hypothesis for the early Earth are that ... 

Figure 5. Model ages for instantaneous core formation in planetary bodies as a function ofparent body size. Given the small size of the Moon, the W model age of the Moon is relatively young. This suggests that the Moon formed by a unique process, consistent with the giant impact hypothesis for the origin of the Moon.

FIG. 3.4 Illustration of the Impact Hypothesis. This is the currently favored theory for the creation of the moon. The details of this impact, such as the angle and size of the impacting body, are still under active debate. 

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