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40 terms

Ch 14

STUDY
PLAY
since 1960s, cause of plate tectonics
convection
simple symmetrical downfold is
syncline
most complicate list below is
overthrust fault
totality of materials ejected from a volcano
pyroclastic material
crustal block which is downthrown with a deep fault scarp
graben
most widespread of all intrusive forms
dike
first comprehensive theory of continental drift
alfred wegener
deformation of earths crust
diastrophism
on richter scale, large earthquakes are ___ or above
7
volcanic activity that takes place deep under crust is
plutonic
relatively cooler magma result of
relatively high amount of silica present
evidence of former surface volcanic activity
flood basalt
pacific ring of fire
volcanoes around pacific ocean
most massive form of igneous intrusion
batholith
simple symmetrical upfold
anticline
radial walls extending outward from a volcano
dikes
water collected in small bodies along active fault line
sag ponds
uplift of block of land between two parallel faults
horst
shield volcanoes are ___ than composite volcanoes
wider
detects swelling and possible eruption
tiltmeter
wgeners early rejected
failure to provide plausible cause
plate boundaries which are ____ are likely to make island arcs
convergent between oceanic plates
grabens are commonly found in association with
horsts
formed on top of earths crust
flood basalt
another name for volcanic mudflow
lahar
under earths surface expect a convection current
under midocean ridges
associated with lateral slippage,
transform
one of the reasons scientists strongly believe in plate tectonics
ability to explain all of the above
rate of sea floor spreading in the atlantic
less than 1 cm per year
term for a piece of crust which has been in collision
terrane
refers to surface of earth directly above center of earthquake
epicenter
waves generated by earthquakes
tsunamis
tsunami is
another term for seismic sea wave
in earthquakes, P waves
are faster than S waves
earths crust is composed of at least ___ major plates
a dozen
crustal plates are on the order of ____ km thick
100
hot plastic material of asthenosphere is most conspicuous at
divergent plate boundaries
usually used to refer to SAME plate boundary
divergent, constructive,
NOT a form of tectonism
volcanism
lava flows often create
flattish plains