Terms in this set (28)
if rock layers bend rather than break, they are folded- anticlines(old in middle), synclines, adn recumberent folds. If the hinge line of a fold is not horizontal-plunging.
fracutres are either joints or faults: joint is where movement has not occured
the compass direction of a line formed by the intersection of an inclined plane with a hor plane is
folds in rocks hsow that the rock behaved in a
a fold shaped like an arch with the oldest rocks exposed in the center.
trough spaced fold with the youngest rocks exposed in the center
bed dips away from middle/oldest rock exposed in the center
fracuture in bedrock along which movement has taken place aer called
normal fault, the hanging wall block has moved downward relative to the footwall
normal faults occur where there is horizontal extensions
faults that typcially move older rock on top of younger ones aer thrust faults.
Chpter 16: elastic rebound theory- involved the sudden release of progressively storied strain in rocks, causing movememtn along a fault
the point within earth where seismic waves orginate is called
p waves are compressional; fastest
ritcher scale measures magnitude
beniof zones- oceanic trenches
earthquakes at divergent plate boudnaries are shallow focus
a zone of shalloe earthquakes alone normal fault-div
seismic gap is an active fault where earthquakes havent occurred for a long time
Chapter 19: southern superr-Gon
sliding of the sear floor benearth a continent or island ar is
plates are oart of a ridig outer shell of the earth called the
san Andreas- transform fault
ocean ocean converegence
passive continental margine aer created by div
haw islands-mantle plume
metalic ores- via hydro thermal process.