Weathering
the type of weathering in which rock is physically broken into smaller pieces
what is mechanical weathering?
large, ancient, landmass that was composed of all the continents
what is pangea?
when two plates press up against each other and form mountains and volcanoes
extinct marine arthropod - around 521 million years ago - example of an index fossil
what is a trilobite fossil?
4.5 billion years
what is earth's age?
the process that breaks down rock through chemical changes
what is chemical weathering?
the soft layer of the mantle on which the tectonic plates move
what is asthenosphere?
a tectonic plate boundary where two plates collide, come together, or crash into each other
what is a convergent boundary?
layers of rock
what are strata?
183 mya
the jurassic extinction
when water seeps into rock cracks and freezes, expanding and breaking the rock around it
what is frost wedging?
the rigid outer part of the earth, consisting of the crust (the tectonic plates)
what is lithosphere?
a plate boundary where two plates move away from each other
what is a divergent boundary?
an igneous rock layer formed when magma hardens beneath Earth's surface.
what is an intrusion?
1924
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the process by which wind, water, ice, or gravity transports soil and sediment from one location to another
what is erosion?
the theory that continental masses were "drifting" across the earth
what is continental drift theory?
a break in the earth's crust
what is a fault?
the top rock layer and its fossils is the youngest and the bottom is the oldest
what is the law of superposition?
1952
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process in which sediment is laid down in new locations
what is deposition?
the theory that pieces of earth's lithosphere are in constant motion, driven by convection currents in the mantle
what is plate tectonics?
the boundary between tectonic plates that are sliding past each other horizontally
what is a transform boundary?
the principle that a fault or body of rock is younger than any other body of rock that it cuts through
what is the law of cross-cutting relationships?
12/13/89
when is taylor swift's birthday?