21 terms

Houghton Mifflin Science Grade 4 Chapter 8

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Terms in this set (...)

core
the innermost layer of earth
crust
the outermost layer of earth
deposition
the dropping of sediment moved by water, wind, and ice
erosion
the movement of rock material from one place to another
igneous rock
the type of rock that is formed when melted rock from inside earth cools and hardens
lava
molten rock that reaches earth's surface, such as when a volcano erupts
magma
molten rock beneath earth's surface
mantle
a thick layer of rock between Earth's crust and core
metamorphic rock
new rock that forms when existing rocks are changed by heart, pressure, or chemicals
mineral
a solid, nonliving material of specific chemical makeup
rock cycle
the continuous series of changes that rocks go through
rock
a solid material that is made up of one or more minerals
sedimentary rock
a type of rock that forms when sediment becomes pressed together and hardens
sediment
sand, particles of rock, bits of soil, and the remains of once-living things
weathering
the slow wearing away of rock into smaller pieces
plate tectonics
the moving of huge sections of the Earth's crust
tectonic plates
huge sections of the Earth's crust
landslide
sudden movement of loose rock and soil down a steep slope
earthquake
sudden movement of earth's crust, usually along a fault
fault
crack in the earth's crust
volcano
opening in the earth's crust through which hot ash, gases, and molten rock escape from deep inside the Earth