Geochemists have determined that differences in the distribution of chemical elements in Earth's crust, mantle and core - in contrast to the distribution of chemical elements in the initial solar nebula - may be in part due to Select one: a. inhomogeneity in the initial dust cloud b. early melting and differentiation of materials of different density c. nucleosynthesis within our sun O d. cosmic ray bombardment since earth formed A tectonic plate is composed of the: Select one: a. continental and oceanic crust b. lower mantle and asthenosphere C. core and lower mantle d. uppermost mantle and crust

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