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S. Zelenko

Terms and facts about the earth's structure

tephra rocks formed from sediments that have been pressed into rock
physical weathering a break in rock at the boundary between two moving masses
crust water, ice or windblown sand breaking down rock
sedimentary rock the volcanic belt that encircles the edge of the Pacific Ocean
Ring of Fire a trembling or shaking of the earth's crust
chemical weathering top layer of the earth ranging 40 miles to 3 miles thick
core breaking of rock without any movement at the break
Moho the individual substances that make up rocks
fracture sedimentary or igneous rock changed by heat or pressure
soil the innermost region of the earth
magma rocks that form when molten rock solidifies
epicenter scale to measure the strength of an earthquake
magnitude scientist who studies the earth
focus the boundary between the crust and the mantle
tremor melted rock
minerals a weak earthquake
igneous rock the point underground where an earthquake begins
earthquake rocks that bend without cracking
fumaroles the place at ground level directly above the focus
metamorphic rock it's made up of humus and weathered rock
fault lava fragments that solidify into rock instantly
seismologist acids breaking down rock
geologist a scientist who studies earthquakes
fold an escape vent for underground gases near active volcanoes

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