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Ch 28 int sc

The Changing Earth

What is asthenosphere? The portion of the upper mantle beneath the rigid lithosphere where rock flows.
What is continential drift? A theory stating that pieces of pangaea moved apart to form the senve continents on Earth.
What is cross-cutting relationships? An idea stating that a vein of rock that intersects layers of rock is younger thatn the layers.
What is epicenter? A point on the Earth's surface that is directly above the focus of an earthquake and where the seisic waves reach first.
What is fault? A break or crack in the Earth's crust where two pieces of the crust become offset.
What is faunal succession? An idea stating that fossils can be used to identify the relative age of layers of a rock formation.
What is focus? The place underground where the seismic waves of an earthquake originate.
What is geology? The study of rocks and materials that make up a celestial body such as Eartrh and the processes that shape it.
What is inclusions? Rock pieces found within another rock that are older than the surrounding rock.
What is lateral continuity? An idea stating that the layers of sediment extend in all directions when they form and before they become rock layers.
What is lithosphere? A lahyer of Earth that includes the crust and upper mantle.
What is original horizontally? An idea stating that sediments settling out from bodies of water are deposited hkorizontally or neary horizontally in layers that lie parallel or nearly parallel to Earth's surface.
What is paleontology? the study and indentification of fossils.
What is Pangaea? A proposed former supercontinent supposedly composed of all the continental crust of Earth and later fragmentexd by drift into Laurasia and Gondwana.
What is plate tectonics? A theory stating that giant pieces of Earth's lithosphere move and interactr on the surface, resulting, for example, in land formations, earthquakes, and volcanoes.
What is P-wave? A primary seismic wave that pushes and pulls in the same directions that it travels through Earth. This kind of body wave is faster than an S-wave.
What is realtive dating? A teechnigue used to put events in the order that they have happened.
What is sea-floor spreading? Desscribes how the sea floor on either side of a mid=ocean ridge moves away from the ridge and creates a rise or valley.
What is seismic wave? A wave that results from an earthquake. There are two kinds of seismic waves(P and S waves) that travel through Earth and surface waves that travel along Earth's surface.
What is subduction? A process occurring at the convergent plate boundary.
What is superposition? An idea stating that the bottom layer of a rock formation is older that the layer on top because the bottom layer formed first.
What is S-wave? A secondary seismic wave that moves sideways or up and down perpendicular to the direction that it trav els through Earth. This kind of body wave is slower thatn a P-wave.
What is tsunami? A huge wave generated by an underwater earthquake or landslide.
Created by: jazznsoul64