found, “that some layers had minerals in which the remnant magnetism, which was the exact opposite orientation as todays magnetic field. From this he concluded that the Earth’s magnetic field has reversed from time to time” (Paleomagnetism and Continental Drift). The study of the sea floor spreading, while using paleomagnetism has been successful as well. Mid-ocean ridges are places in the ocean where two plates meet and have any continent that may be around them. These plates are being pushed away
PHY 226 ASSIGNMENT BY OGUNNAIKE FIYINFOLUWA ESTHER INDUSTRIAL PHYSICS; APPLIED GEOPHYSICS
plate tectonic processes. Frisch et al. (2011) defines plate tectonics as a theory formed in 1970s that explains the process of how the multiple rigid lithospheric plates on the Earth’s crust move across the molten, ductile asthenosphere. As the plates move due to convection currents, they can then form geological features such as volcanoes, mountain belts, etc. and can trigger natural disasters such as volcanism, earthquakes, etc. There are 3 focal plate boundaries formed by plate tectonics, convergent
INTRODUCTION Geophysical surveys have been used to identify the internal structure of the earth. Seismology is important for the study of the earth's interior because their resolving power is superior to that of other geophysical methods. This is because it provides depth, P-wave and S-wave propagation and velocities which are the basis for models for physical and chemical properties of each layer within the earth. (Stein, 2009) From geophysical surveys it has been found out that there are compositionally
religious beliefs to how they secured food, the origin of the Native Americans is quite interesting as to how many theories have been created due to the fact that no one knows where they have come from and how they got there. Along with the civilizations that emerged prior to the European invasion of America. A theory that some scholars believe in, is called the Diffusion Theory. This theory is to believe that Native Americans actually weren’t native to their country, forty thousand years ago, and that
been a transgression in sea level, rapid continental break up facilitated by tectonics, causing rifting and rapid sea level rise would have had severe biological implications. This limits the ability to define a boundary stage, as the geological events occurring were not useful for the preservation of a continuous fossil record. As this sea level transgression occurred, the habitable area available to developing marine metazoans expanded, coupled with continental break up hindering migration, the rise