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THEORY OF PLATE TECTONICS CHAPTER 10 SECTION 3 PAGE 280-289 By: Brielle, Rachel, and Alec TERMS Plate Tectonics is the belief that scientist have in which the Earth’s crust and upper mantle is broken into sections. This was created by combing the theory of seafloor spreading and continental drift The lithosphere are the plates that make up the crust and the upper part of the mantle. Plates are parts of Earth’s crust that are broken into sections The asthenosphere is the liquid section on which the plates move. Oceanic plates are plates that lie underwater. Continental plates are plates that are on land WHAT ARE PLATES? Plates are the sections of the lithosphere that move on the asthenosphere Different boundaries can form mountain ranges, earthquakes, faults, and volcanoes There are three different types of boundaries A divergent- when plates move apart A convergent- when plates collide A transform- when plates slide past each other TYPES OF PLATES Oceanic Plates colliding with Continental plates can form subduction zones. Subduction Zones are where oceanic plates sink under the continental plates creating landforms such as mountains. Strike-Slip Faults are created at transform boundaries when two plates slide past one another without moving apart or colliding with one another Normal Faults are formed when forces stretch the Earth’s crust Causes blocks of crust to break and tilt or slide down the broken surfaces of crust Rift Valleys are formed when magma gets forced up through East African Rift Valley Seafloor Spreading forms where oceanic plates continue to separate Mid-Atlantic Ridge WHAT IS THE CONVECTION CURRENT? Scientist believe that the plates move because of the convection current in the mantle. A convection current is a entire cycle of heating, rising, cooling, and sinking. Causes thermal energy to move from the heat source to the other portions of the liquid The plates of the lithosphere are then moving on the asthenosphere. REVIEW An oceanic and a continental plate colliding can cause a subduction zone The current in Earth’s mantle that transfers heat in Earth’s interior is a convection current The theory that scientist combine to develop the theory of plate tectonics was created by a seafloor spreading theory and continental drift theory Sections that move on a plastic-like layer of the mantle is the plates
