Announcements: Read Chapter 5 for Thursday. Homework#3 due ...
Plate Tectonics 6.E.2.2 Explain how crustal plates and ocean basins are formed, move and interact using earthquakes, heat flow and volcanoes to
Looking at the world map, what do you notice about the shape of the continents? The world didnt always look like that! It used to look like this: Pangaea Supercontinent
How is this possible?!?!? Plate Tectonics Theory The lithosphere is divided into a number of large and small plates and the plates are floating on the mantle
Lithosphere = the Earths crust plus the upper portion of the mantle layer How Plates Move A Canadian scientist, J. Tuzo Wilson, claimed the lithosphere is broken into separate sections called plates. These plates fit
together along cracks in the lithosphere. Scientists realized that the continental drift idea could be explained by sea floor spreading. Wilson took what these scientists knew and combined it with his idea about Earths plates into a single theory. A scientific theory is a well-tested concept
that explains a wide range of observations. How Plates Move (Cont.) (Cont.) Sea floor spreading provides the driving
mechanism for movement However, it is not the continents that are moving, but the plates of lithosphere floating in effect on the asthenosphere The lithosphere is made up of about 20 plates which move relative to each other in several ways The theory of plate tectonics states that pieces
of Earths lithosphere are in slow, constant motion, driven by convection currents in the mantle. The theory of plate tectonics explains the formation, movement, and subduction of Earths plates. Evidence of Plate
Movement Major Tectonic Plates of the World Plates of lithosphere are moved around by the underlying hot mantle convection cells
Convection Convection is heat transfer by the movement of currents within a fluid. During convection, heated particles of fluid begin to flow. This flow
transfers heat from one part of the fluid to another. Heat from the core and the mantle itself causes convection currents in the mantle.
Examples of Convection Examples of Convection (Cont.) Convection Currents Many geologists think that plumes of
mantle rock rise slowly from the bottom of the mantle toward the top. The hot rock eventually cools and sinks back through the mantle. Over and over, the cycle of rising and sinking takes place. There are also convection currents in
the outer core. These convection currents cause Earths magnetic field. As the Earths plates move, they collide, pull apart, or grind past each other, producing spectacular changes in Earths
surface. These changes include volcanoes, mountain ranges, and deep-ocean trenches. Plate Boundaries Types of Plate Boundaries Divergent boundaries (also called
spreading centers) are the place where two plates move apart. Convergent boundaries form where two plates move together. Transform fault boundaries are margins where two plates grind past each other without the production or destruction of the
lithosphere. Types of Plate Boundaries Divergent boundaries: Oceanic Ridges and Seafloor Spreading
Oceanic ridges are continuous elevated zones on the floor of all major ocean basins. The rifts at the crest of ridges represent divergent plate boundaries. Rift valleys are deep faulted structures found along the axes of divergent plate boundaries. They can develop on the
seafloor or on land. Seafloor spreading produces new oceanic lithosphere. Spreading Center
Convergent Boundaries A subduction zone occurs when one oceanic plate is forced down into the mantle beneath a second plate. Oceanic-Continental Denser oceanic slab sinks into the asthenosphere.
Pockets of magma develop and rise. Continental volcanic arcs form in part by volcanic activity caused by the subduction of oceanic lithosphere beneath a continent. Examples include the Andes, Cascades, and the Sierra Nevadas.
Two oceanic slabs converge and one descends beneath the other. This kind of boundary often forms volcanoes on the ocean floor. Volcanic island arcs form as volcanoes emerge from the sea. Examples include the Aleutian, Mariana, and
Boolean Matrices Matrices with only 0s and 1s as entries are called Boolean matrices. Boolean multiplication: x y = min(x,y) Boolean addition: x y = max(x,y) Boolean matrix multiplication A B is defined by Cij = (aik bkj) A B:...
John Rice, Epsilon Systems Solutions. ... Standard 1189 encourages the formation of the Contractor IPT; similar makeup to Federal IPT ... Safety and Design Integration DOE-STD-1189-2008. Design Process by Project Phase. The material in this section is based on Ch...
Women in Physics, A Caribbean Perspective Kandice Tanner University of California, Berkeley Areas of Research- Graduate studies 7 women( total students 12) pursuing graduate studies in Astronomy, Materials Science, Environmental Physics, Medical Physics and Quantum Physics Theoretical and Experimental K-12...
SabiRedwood, Maggie Telfer, Rachel Ayres, Jane Neale, Jody Clarke, Isabel Oliver, Peter Vickerman. Clare Fleming, JelenaSavović, Helen Thorely, Tim Jones, Elsa Marques ... Sexual Health Improvement for Populations and Patients SHIPP - a proposed Health Integration Team
(Page 11, 2004 French as a second language, Nine-Year program of studies (Grade 4 to 12) OAG: function in the language and culture General Outcomes Culture Students will use their knowledge of different Francophone cultures and their own culture to...
Ready to download the document? Go ahead and hit continue!