marine environment Flashcards
shape and depth of the sea floor
bathymetry
deepest parts of the ocean
trench
transition from continental crust to oceanic crust
continental slope
gentel angle of slope down to the edge of the abyssal plains
continental rise
shallow submarine terrace of continental crust
continental shelf
flat depositional surface of the sea floor
abyssal plains
200 meters water depth
neritic zone
200 - 2000 meters water depth
bathyal
2000 - 5000 meters water depth
abyssal zone
more than 5000 meters water depth
hadal zone
region between mean high water and low water marks of tides
foreshore
region of the shelf between the low tide mark and depth to which waves normally affects the sea bottom
shoreface
the deeper shelf area between the fair weather and storm weather bases
offshore transition zone
region below the storm wave base and extends out to the shelf edge break at around 200 meters depth
offshore zone
the cyclic rising and falling of earth’s ocean surface
tides
bulge of water due to gravity
tidal bulge
at any point of the surface the level of water will rise and fall twice a day as two bulges are passed in each other
diurnal tides
when the sun and moon are aligned, occurs during full and new moon
spring tides
when the sun and moon are at right angles, the tides are not too high or low
neap tides
vertical motion of tides
tidal current
tidal current moves toward the land
flood
tidal current moves away the land
ebbs