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TermDefinition
Theory of Plate Tectonics The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle.
Theory of Pangea Theory of Pangea was a theory that explained how continents shift position on Earth's surface.
Continental Drift Theory German meteorologist Alfred Wegener first presented the concept of Pangea (meaning “all lands”) along with the first comprehensive theory of continental drift, the idea that Earth's continents slowly move relative to one another.
Mid-Atlantic Ridge Theory The Mid-Atlantic Ridge (MAR) is known as a mid-ocean ridge, an underwater mountain system formed by plate tectonics. ... The rift marks the actual boundary between adjacent tectonic plates, and is where magma from the mantle reaches the seafloor.
Earth from In to Out Inner Core, Outer Core, Mantle, Crust
Mesosphere the region of the earth's atmosphere above the stratosphere and below the thermosphere, between about 30 and 50 miles (50 and 80 km) in altitude.
Asthenosphere the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
Lithosphere the rigid outer part of the earth, consisting of the crust and upper mantle.
Methods in studying Plate Movements Three different geologic methods help determine the trajectories of plates: paleomagnetic, geometric, and seismic. The paleomagnetic method is based on the Earth's magnetic field.
Subduction the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
Magnetism The earth's magnetic field is always changing direction, which causes the iron in the crust to point/move north and south. ... Since the magnetic field is moving, the iron in the crust will show which was north and south.
Relative Dating A Fossil or Mineral that died around the same time period as each other.
Absolute Dating The Relationship between A Fossil or Mineral that died at completely different time periods.
Cinder Cone Volcano A cinder cone is a steep conical hill of volcanic ash, or cinder that has been built around a volcanic vent. The pyroclastic fragments are formed by explosive eruptions or lava fountains from a single, typically cylindrical, vent.
Volcanic Crater A volcanic crater is an approximately circular depression in the ground caused by volcanic activity. It is typically a bowl-shaped feature within which occurs a vent or vents.
Composite Volcano A composite volcano, also formally known as a stratovolcano, is a conical volcano built up by many layers of hardened lava, tephra, pumice and ash.
Shield Volcano a broad domed volcano with gently sloping sides, characteristic of the eruption of fluid, basaltic lava.
Created by: Jonas G
 

 



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