MTTC Integrated Science - Earth & Space Sciences Questions And Answers
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Course
MTTC
Institution
MTTC
MTTC Integrated Science - Earth & Space
Sciences Questions And Answers
mantle drag plates move due to the friction between the lithosphere and the asthenosphere
trench suction involves a downward frictional pull on oceanic plates in subduction zones
due to convection currents
convergent plat...
3) continental plate + oceanic plate = ocean goes under continent, mountains on one side,
oceanic trench on the other
subduction zone the region where an oceanic plate sinks down into the asthenosphere at a
convergent boundary, usually between continental and oceanic plates
divergent plate boundary when two adjacent plates move away from one another. the
lithosphere cracks, pushes molten magma through the cracks, the magma cools, and new crust is
formed. two types:
, MTTC Integrated Science - Earth & Space
Sciences Questions And Answers
1) ocean + ocean = oceanic ridge systems
2) continent + continent = rift valleys
transform plate boundary When two plates slide past one another
cause: earthquakes when they snap past one another
also called "strike-slip faults"
geologic fault a fracture in the earth's surface created by movement of the crust. most are
found on tectonic plate boundaries. three types:
1) normal fault
2) reverse fault
3) strike-slip fault
normal fault A type of fault where the hanging wall slides downward; caused by tension in
the crust
reverse fault a type of fault where the hanging wall slides upward; caused by compression
in the crust. steep dip
, MTTC Integrated Science - Earth & Space
Sciences Questions And Answers
strike-slip fault a type of fault where rocks on either side move past each other sideways
with little up or down motion
Geologic folding a region of curved or deformed stratified rocks. rock strata are normally
formed horizontally, so when they are found vertically formed, it is clear that geologic folding
took place
anticlines and synclines Anticlines are upward arching folds with older rocks near the core
of the fold
synclines are downward arching folds with younger rocks near the core of the fold
Orogenesis The process of mountain building that occurs when large-scale compression
leads to deformation and uplift of the crust; literally, the birth of mountains.
folded mountains form from the long-term deformation and metamorphosis of
sedimentary and igneous rocks. usually occur in chains and form at convergent plate boundaries
, MTTC Integrated Science - Earth & Space
Sciences Questions And Answers
faultblock mountains occur at normal or reverse faults with high dips where portions of
the Earth's crust are displaced along the faults
oceanic ridges formed at divergent boundaries beneath the ocean. when plates move apart,
material from the mantle rises up and creates long mountain chains
Volcanic Mountains form from the accumulation of products of volcanic eruptions, such
as ash and lava. often occur singularly, unlike all other kinds of mountains which occur in chains.
continental drift The hypothesis that states that the continents once formed a single
landmass, broke up, and drifted to their present locations
continental crust is also called? sial
Thickness of continental crust 10-50 km
thin continental crust is _____
thick continental crust is _____ thin is OLDEST OROGENIC ACTIVITY
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