quiz 4 Flashcards
(38 cards)
study of sediments
sedimentology
involves looking at ancient earthquakes
paleoseismicity
**zone of turbulent water
:whirlpool
:occur in narrow bays
maelstrom
what causes tides
1) earth rotation: centrifugal force
2) gravitational pull of moon and sun
2 tidal bulges
1) moon pull on earth’s ocean (gravity bulge)
2) inertia of earth (inertia bulge)
highest high tides
lowest low tides
spring tides
lowest high tides
highest low tides
neap tides
:occur when earth-moon-sun line up
:constructive interference
spring tides
:occur during first quarter moon or third quarter moon
:destructive interference
neap tides
3 types of tidal patterns
1) diurnal tide pattern
2) semiurnal tide pattern
3) mixed tides
have 1 high and low tide Q24hrs
diurnal tide patterns
have 2 equal high and low tides Q24hrs
semiurnal tide pattern
have 2 unequal high and low tides Q24hr
mixed tides
:have no tides –> canceling of tides
:norther hemisphere
–> currents clockwise
–> tides counterclockwise
Amphidromic points
area of extreme tides
Macrotidal Regime
tide patterns preserved in the rock record
tidal rhythmites
characteristics of coasts
steeper slope –> courser material
features along the coast/ beach
- ripples
- rip current
- rillmarks
- swash marks
- groins
- layering in beach sand
2 types of coasts
1) emergent coasts
2) submergent coasts
***land is rising relative to sea level
:erosional coasts
:lose material
emergent coasts
***land is sinking relative to sea level
:depositional coasts
submergent coasts
what makes coasts submergent or emergent
1) tectonic forces
2) changes in sea level
3) changes in winds and currents
glacially cut canyons that become flooded with sea water
fjords
forms where a river meets the ocean or lake
delta