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24 Cards in this Set

  • Front
  • Back
the thin and solid outermost layer of the earth above the mantle
the layer of rock between the earh's crust and core
outer core
the liquid layer of the earth's core that lies beneath the mantle and surrounds the inner core. It is 2200km thick.
inner core
it is the solid, dense dense center of our planet that extends from the bottom of the Earth. It is 1230km thick.
it is the outermost rigid layer of the earth. it is divided in to tectonic plates
it is the plastic layer of the earth in the mantle on which pieces move. it is made of solid rock that moves very slowly
it is the strong lower part of the mantle. it extends from the bottom of the asthenosphere to the earth's core
oceanic crust
it is mostly made of oxygen, silicon. and aluminum. it has almost twice as much iron calcium, and magnesium which; it is thinner and denser than the continental crust forms minerals
continental crust
it is mainly made of oygen silicon and aluminum
be able to layer the 5 layers of the earths interior
how many tectonic plates are there
the are 10
how have scientists mapped the earth's interior
they map earth's interior when earthquakes produce seismec waves
how have scientists been able to directly observe material from the mantle
in some places magma pushes through the surface which alwos scientists to observe the mantle directly; volcanoes
continental drift
the hypothesis that continents onced formed a single landmass, broke up and drifted to their present location
alfred wegener
he made the hypothesis that the continents onced formed a single landmass
describe three ways fossils provide evidence of continental drift?
1. there are the same fosssils of plants and animals in different continents
2.with out continental drift the pattern would be hard to explain
3.they couldn't have crossed the ocean
sea floor spreading
the process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies
where is the older crust at a mid ocean ridge
older crust gets pushed farther away; younger crust is closer to a mid ocean ridge than the older crust
magnetic reversals
is when poles change places
how do magnetic reversals show that the sea floor is expanding in some areas
minerals in the magma are magnetic. the the molten cools the record of these compasses remains in the rock. then the record is slowly carries away from the speading center
an ancient plant fossil that is found in many contintents
fossils of small aquatic reptiles
which layer do the plates move on top of
the asthenosphere
which layer is made up of tectonic plates
the lithosphere