Marine Geology Flashcards
Primary Coasts
Young coasts in which terrestrial influences dominate. Jagged and irregular shape
Shorelines Unstable
Why?
Constant changing sand
Because waves and their tides
Secondary Coasts
Older and are straight due to shoreline straightening
CCD
Calcium carbonate compensation depth; 4,000 meters
Oozes
Deep sea sediments with 30% biogenous material
Sediments smallest to largest
Clay, silt, sand, granule, pebble, cobble, boulder
Problem with east and west coast
Not as much land because of melting icebergs
Protect from human interference
Groin, jetty, sea well, dredging
P Waves
Primary seismic, pass through solid and liquid, similar to sound waves, faster than S waves
S waves
Secondary seismic, cannot travel through liquids, don’t go through the core
How are P waves and S waves alike?
Produced earthquakes, can travel through solids
Decay of radioactive elements causes what?
Center of earth to be very hot
Oceanic crust is more or less dense because it is made of basaltic rock?
More dense
New rock found? As you move farther away what happens to the land
Spreading centers. As you move farther away, it gets older and thicker
Subduction zone
Old sea floor is destroyed
Divergent
Convergent
Transform
Plates move away
Plates move towards eachother
Plates move past eachother
Terrigenous
Biogenous
Hydrogenous
Cosmogenous
From nearby land masses
From organisms
Precipitated directly from seawater
From space
Cross section of planet from top to bottom
Crust, mantle, core
Lithosphere, Asthenosphere, Mesosphere, Outer Core, Inner Core
Beach Profile
A. Secondary Dune B. Primary Dune C. Berm D. Berm Crust E. Scarp F. Low Tide Terrace G. Longshore Bar H. Longshore Trough I. Back shore J. Foreshore K. Offshore
Convection Cell
The “lava” current. The current moves and the land moves away
