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geology final part 2
| Question | Answer |
|---|---|
| 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
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