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30 Cards in this Set

  • Front
  • Back
Continental Drift
Earth's masses have migrated for 225 million years.Wegener 1912
1.can make continents fit
2.matching rocks and fossils
3.climatic anomolies
-coal formed from tropics is found in PA
Super continent formed by collision of all continents, 225 million years old
Subduction Zone
2 plates collide and denser oceanic crust dives
-forms ocean trenches and seismically active regions
Transform Faults
faulting occurs between mid ocean ridge,produces a relative horizontal motion
-no crust formed or consumed
Hot Spots
high activity of plate moving
-100 worldwide (ring of fire)
an assembly of minerals bound together
Sedimentary Rock
1 of 3 rock types
-formed by compaction, cementation and hardening of sediments derived from other rocks
The compaction,cementation and hardening of sediments in sed rock
Metamorphic Rock
an existing igneous and sedimentary rock that has undergone profound physical and chemical changes under increased pressure and temperature
-foliated or nonfoliated texture
Convergent Boundaries
characteristics of collision zones, where areas of continental and oceanic lithosphere collide
oceanic-oceanic convergent
one oceanic crust subducts and creates subduction zone, melting and bubbling up is created near bottom of zone. volcanoes form on surface and creates an island
oceanic-continental convergent
get an ocean trench, melting and bubbling reaches up to surface on continental crust and creates volcanoes inland from coast.
continental-continental convergent
-mountain ranges are formed this way and oregany mountain is formed where high mountains are created
ex. Himalayas and Alps
Divergent Boundaries
characteristic of sea-floor spreading centers, where upwelling material from the mantle forms new seafloor and lithospheric plates spread apart, new crust is formed
mid ocean ridges
a submarine mountain range that extends more than 65,000 km worldwide and averages more than 1000 km in width;centered along sea-floor spreading centers
Sea-floor spreading
the mechanism driving the movement of continents
plate tectonics
accepted as the foundation of crustal tectonic processes
an element or combination of elements that forms an inorganic natural compound;described by a specific formula and crystal structure
rock cycle
a model representing the interrelationships amoung the three rock-forming processes, shows how each can be transformed into another
geologic cycle
a general term characterizing the vast cycling that proceeds in the lithosphere. It encompasses the hydrologic cycle,tectonic cycle and rock cycle
a common extrusive igneous rock,comprising the bulk of hte ocean-floor curst, lava flows, and volcanic forms
a course-grained(slow-cooling) intrusive igneous rock.characteristic of continental crust
earth's outer shell of crystalline surface rock, ranging from 5 to 60km in thickness from oceanic crust to mountain ranges.
region of the upper mantle just below the lithosphere;the least rigid portion of earths's interier and known as the plasic layer, flowing slowly under extreme heat and pressure
large area in earths crust.occurs between core and crust. has convection currents in it
the deepest inner portion of earth representing one third of its entiere mass, seperated into 2 zones a solid iron inner core surrounded by a dense,molten,fluid metallic iron outer core
seismic waves
the shock wave sent through the planet by an earthquake or underground nuclear test, provides evidence of earths layers
magma that issues from volcanic activity onto the surface
molten rock from beneath earths surface
a mass of intrusive igneous rock that has cooled slowly in the crust