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16 Cards in this Set

  • Front
  • Back
distribution of volcanoes
occur at hot spots or convergent boundaries forming volcanic mountains or volcanic island arcs "ring of fire"
sea floor spreading
magma rises at the mid-ocean ridge forming new crustal material and plates move apart
mid-ocean ridge
worlds longest mountain chain, the rift valley running down the center of the ridge is the site of new plate growth
thickness of the sediments on the ocean floor
as you go from the mid-ocean ridge the sediments get thicker and older
subduction zones
a denser oceanic plate goes under either a continental plate or another less dense oceanic plate to move into the mantel
subduction zones and volcanos
subduction zones from magma then the magma comes out of the volcano
trench
surface feature of a subduction zone, deepest parts of the ocean
ancient mountain chain
running from NE south america to NW africa to Eastern united states across Central scotland and into scandinavia, this chain was considered evidence for continental drift and later plate tectonics
magnetic reversals
used to show pattern of rock formation around mid-ocean ridges, reflected the reversal of magnetic north over millions of years; supported theory of plate tectonics
glacial evidence
rock striations indicated a single continental glacier stretching over africa, south american, & madagascar; support for idea of continental drift & theory of plate tectonics
role of sample size in density
the amount of sample size does not affect density because it is calculated to be mass per 1 unit of volume
rocks
naturally occurring objects usually made of 2 or more minerals
minerals
crystalline structure
solid
naturally occurring
definite chemical makeup
topographic map
shows relief & surface structure of an area using contour lines
a fair test
a repeatable procedure for manipulating only one variable in order to answer a question
floater
an object or material which is less dense than the substance it is in; usually molten or a liquid