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
Be aware of areas of ongoing challenge from a medication safety perspective; and. Be aware of tips and tools to support organizations in identifying potential areas of vulnerability and implementing improvements. Learning Objectives.
Students attempt to determine their secret identity (taped on their back) by circulating and asking "yes/no" questions of classmates. They are allowed three questions per classmate (or unlimited questions until they receive a no response).
e.g., Bushfire potential with 5 scales Weighting is to express the relative importance between 9 perils, in terms of damage to buildings (historical and potential) Four sub-factors were assessed using Analytical Hierarchy Process (AHP). The final relative weight for each...
11. Why do caves, arches, stacks, stumps form on headlands of hard rock coasts? 12. How is material transported along the coastline? 13. How are spits formed due to deposition of sediment? 14. How is the UK coast managed/protected (Hard...
Treated OPCs with Klotho. Klotho enhanced their maturation. Activated AKT and Erk1/2 signaling pathways possibly through FGFR. Klotho treatment also increased myelin protein production. Chen, Ci-Di et. Al. The antiaging protein klotho enhances oligodendrocyte maturation and myelination of the CNS....
Great Diversity dinoflagellates & ciliates euglenoids brown algae & diatoms red algae green algae miscellaneous? Problems with Protist Classification Euglenozoa Animals Streptophyta (includes land plants) Choanoflagellida Fungi Chlorophyta Rhodophyta Stramenopila Alveolata Archaea Bacteria Something's not right here!
Chronology Self-Test from the Depression to Present Timeline Self-Test To use this show, go to view and click "notes page." Then start slide show. When you want to read more about an answer, end the show and the notes page...
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