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geology final part 2

QuestionAnswer
longshore current MOVING MASS OF WATER PARALLEL TO SHORE
main source of beach sand? rivers
longshore drift the movement of sand along the shoreline, it can seal up a bay with a baymouth bar
what is estuary drown river mouth, drowned by rise of sea level
what is brackish? fresh and salt water mix
what is barrier island? narrow, low, parralel close to shore
what are the three diferent types of stress? compressive, tensional, shear
what is compressive? squeezing, shortens and thickens earths crust
what is tensional? pulls away, thins and lengthens bodies
what is shear? works on different planes, subduction zones
strike measured always north, angle, and east or west
dip angle, nw, ne, sw,se
anticline? upward fold or an arch shaped fold dips pointed downward away
syncline? downward fold trough shaped, dips point towards each other
types of faults dip slip, strike slip, and oblique slip
dip slipe vertical movement, normal dip slip (hanging wall down, footwall up), reverse dip slip is the opposite
strike slipe horizontal movement, right lateral opposite block moved right, left lateral opposite block moved left
oblique slip
what is unconformity? surface representing a gap in geological record. unconformity represents missing rock, rocks above considerable younger then rocks below.
three types of seismic waves p waves, s waves, and surface waves. Surface waves begin at the epicenter. P waves and S waves begin at the focus.
pwaves 1st to arrive and fastest
s waves 2nd to arrive and cant pass through liquid
Explain the significance of the P-wave and S-wave shadow zones pwave shadow zone defines core/mantle boundary. and s wave shadow zone indicates to us that the outer core is liquid.
difference between quake intensity and magnitude intensity is the efffects on buildings and people, measures the effects caused by energy. Magnitude measures how much energy was released.
the worldwide distribution and causes of earthquakes along the pacific belt and mediteranian-himalayian belt. caused by magma movements, mineral transformations, elastic rebound.
metals and ore sources copper (hematite), copper (chalcopyrite), aluminum (bauxite), lead(galena), zinc (sphaperite), silver (by product of pbzn mining), gold (native element)
three elements necessary for petroleum deposits source rock (high organic content carbon), resorvoir rock (high permeability), trap (low permeability)
possible causes of + and – magnetic and gravity anomalies positive (mettalic ores or igneous rocks) negative (thick non magnetic sediements)
gravity higher over dense material, lower over less dense material
ISOSTATIC ADJUSTMENT large mass rapidly removed, erosion leads to uplift. Large mass rapidly added, deposition lead to sinking.
Created by: sanchezdaniel