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6th grade es
Question | Answer |
---|---|
lithosphere | the solid outer layer of the earth that consist of the crust and the ridgid upper part of the mantle. |
inner core | the solid dense center of our planet that extends from the bottom of the outer core to the center of the earth. |
outer core | the liquid layer of earths core that lies beneath the mantle and surrounds the inner core |
normal fault | forms when rocks are pulled apart because of tension.the hanging wall moves down relative to the footwall |
reverse fault | happens when rocks are pushed together by compression. The hanging wall moves up realtive to the footwall. |
strike slipfault | forms when opposing forces cause rock to break and move horizontally. |
boundary | a place where tectonic plates touch. |
Pangaea | Wegener theory that all continents were all formed into one super super continent. |
sea floor spreading | the process by which new oceanic litoshpere forms as magma rises towards the surface and solidifies. |
mid ocean ridges | under water mountain chains that run through earths ocean basins. |
convergant boundary | the boundary formed by the collision of two lithospheric plates. |
divergent boundary | the boundary between two tectonic plates that are moving away from each other. |
transfrom boundary | the boundary between tectonic plates that are sliding past each other horizontially. |
uplift | the rising of regions of the earths crust to higher elevation. |
subsidence | the sinking of regions of th Earth's crust to lower elevations. |
folding | the bending of rock layers due to stress. |
compression | stress that occurs when forces act to squeeze and object. |
tension | stress that occurs when forces act to stretch an object. |
magma | hot liquid rock. |
seismograph | measures the time at which seismic waves arrive at different distances from an eathquake. |
fossils | the remains or physical evidence of an organism preserved bh geological processes. |
magnetic reversals | when earths magnetic poles change places. |
Global positioning system | a system of satellites used to measure the rate of tectonic plate movement. |