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Unit 3 Vocab Katie R

Plate Tectonics

Asthenosphere the upper layer of the earth's mantle, below the lithosphere,
Subduction when 1 tectonic plates is forced under another
Seafloor Spreading a hypothesis that there is a continuous cycle of crust forming by magma intrusion which causes ocean ridges to spread
Mantle Convection when magma in the earths mantle moves in a circular motion
Ridge Push when a ridge pushes an oceanic c plate toward a subduction zone
Slab Pull when a subducting plate pulls the following part of the lithosphere into the subduction zone
Lava molten rock outside of the earth's surface
Magma molten rock in the earth's surface
Tectonic Plate giant pieces of the earth's crust that covers the surface
Theory of Continental Drift Wegner's hypothesis that all the continents used to be joined together and eventually broke apart and moved to where they are now.
Convergent Boundry the point where two tectonic plates move toward each other
Divergent Boundry the point where two tectonic plates move away from eachother
Transform Boundry the point where two tectonic plate slide past each other
Hot Spot an unusually hot area in the earth's mantle
Epicenter the spot on the earth's surface right above the focus of an earthquake
Focus the point where an earthquake originates
Pangea a landmass 200 million years ago that consisted of all the continents
Geohazard hazards that relate geologically that can cause much damage; examples are avalanches
Reverse Fault horizontal compression
Strike Strip Fault horizontal shear
Normal Fault horizontal tension
Compression being made smaller and denser
Tension the process of stretching something out
Shearing causes the material its applying pressure to twist and shred
Felsic igneous rocks made of lighter elements
Mafic igneous rocks made from darker elements
Created by: 9885124152