By A. D. J. Meeuse
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Extra resources for Angiosperm evolution : no abominable mystery
Homogeneous Accretion Models The major difference between homogeneous and inhomogeneous accretion models is the timing of accretion. In the inhomogeneous models, condensation and accretion occur simultaneously, while in the homogeneous models condensation is essentially complete before accretion begins. In most homogeneous accretion models the planets and the Moon accrete from a cool (<100°C), well-mixed, oxidizing solar nebula, similar perhaps in average composition to Cl meteorites. Time scales for accretion are 103-108 years.
New York: W. H. Freeman. 267 pp. CHAPTER 3 The Mantle and Core Detailed Structure of the Mantle The Moho A great deal has been learned about the Moho since it was first reported by Andrija Mohorovicie in 1910. 0 km/sec. It occurs from 10 to 12 km beneath oceans to 30 to 50 km beneath continents (ranging up to 80 km). Compressional waves that travel along the top of the mantle at the Moho are designated Pn waves. 0 km/sec. Seismic anisotropy of P n velocities has been recognized in oceanic areas.
Geoid highs over Africa and the central Pacific reflect hotter (less dense) than average mantle. Hotspots, presumably reflecting rising mantle plumes, are also frequent in these regions. 11 (a) The calculated geoid for a convecting Earth. 3 gm/cm3, contour interval 200 m, and degree 1-6. (b) Calculated topography at the core-mantle boundary. 5 gm/cm3, contour interval 400 m, and degree 1-6. Geoid lows are shaded. After Hager and Clayton (1987). 11b. Both the core-mantle boundary and Earth's surface are upwarped in regions of low seismic velocities and downwarped in regions of high velocities (compare to fig.