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The idea stems from an ancient, cataclysmic collision that scientists believe occurred when a Mars-sized object hit Earth about 4.45 billion years ago. The young Earth was still so hot that it was mostly molten, and debris flung from the impact is thought to have formed the moon.
Haluk Cetin and Fugen Ozkirim of Murray State University think the core of the Mars-sized object may have been left behind inside Earth, and that it sank down near the original inner core.
Originally posted by leisuredrummer
Man! I looked and looked and looked. Thank you. How do I get this puppy deleted?
A Hypothesis Explaining The Dynamics Of Plate Tectonics
Since the introduction of the plate tectonics theory, one of the unsolved fundamental problems has been the understanding of how and when plate tectonics began, as well as initial dynamics of plate tectonics although several mechanisms have been suggested (i.e. the hypothesis that asthenospheric convections drive plates, which is not supported by modern geodynamic theories). The kinematics behind the subduction zones and sea- floor spreading have been well understood and well described by the theory of plate tectonics. However, there is no consensus on the main driving mechanism for the plate tectonics and how it began. We are proposing a hypothesis that attempts to explain several fundamental questions: (1) Why is the planet Earth unique among the silicate planets of the solar system in terms of plate tectonics?; (2) How did plate tectonics start?; (3) What did drive the lithospheric plates in the first place?; (4) Why do mantle plumes form? What kinds of forces are responsible for the plumes?; (5) Why is the outer core fluid?; (6) Why do "ultra-low seismic velocity zones" exist at the base of the mantle?; and (7) Why does the magnetic field of Earth change? The other explanations and examples to be presented include three-dimensional animations of the Paleoproterozoic and Neoproterozoic Earth, and the kinematics and dynamics of the tectonic plates such as the Atlantic and Pacific plates.