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The depth below the surface where the
circular orbits become so small that
wave base
movement is negligible. It is equal to
one-half the wavelength
when waves feel bottom, their speed and
what happens when waves "feel bottom" wavelength decreases while their height
and steepness increases
Perpendicular to shoreline (toward and
away), swash and backwash, Which ever
How does sand move on the beach?
dominates determines whether sand is
deposited or eroded from the berm
the bending of waves so that they move
wave refraction
nearly parallel to the shoreline
changes in wave velocity due to rock
what causes wave refraction
density differences
What are typical features of an emergent High cliffs, steep slopes, exposed
coastline? bedrock
What are features typical of a submer-
Lagoons, bays, tidal flats
gent coastline?
The building of sediment in which wave
What do barrier islands represent? and tidal action move parallel to the
mainland coast
As glaciers receded and melted, sea lev-
What is the cause for most modern estu-
els rose and inundated low-lying river
aries?
valleys
The moon, as the moons gravity pulls the
What is the cause of Earth's tides?
waves this creates high tide and low tide
area where the seabed is below the low-
subtidal zone
est tid
top of highest tide to the landward edge
supertidal zone
of coast
the area of shoreline between low and
interridal zone
high tides
, area in which ocean waves are generat-
fetch
ed by the wind
a shallow zone in a freshwater habitat
littoral zone where light reaches the bottom and nur-
tures plants
How can you recognize desert sedi-
Cross-bedding, ripple marks, and lack of
ments and environments in the rock
fossils, iron oxide
record?
Describe the primary wind-sourced de-
Sand dunes, Loess' and dust
posits?
What are the typical dune shapes? Why -Crescentic, linear, star, dome, and par-
their particular shape? abolic
Desert and steppe lands cover about
30%
what percentage of Earth's land area?
transportation of sediment through a se-
Saltation
ries of leaps or bounces
What will effectively limit further deflation
Desert Pavement
in a given area?
What determines the angle of repose for
the direction in which the wind is blowing
dry sand?
A dune migrates in the direction of incli-
slip face
nation of the ?
Usually glaciers will start where a river
was cutting a V-shaped valley, and the
Why are glacial valleys u-shaped?
glaciers then erode the sides of the valley
into a U-shaped valley.
a half-open steep-sided hollow at the
Cirque head of a valley or on a mountainside,
formed by glacial erosion. circular
a mass of rocks and sediment carried
Moraine down and deposited by a glacier, typical-
ly as ridges at its edges or extremity.
a moraine deposited at the point of fur-
terminal moraine
thest advance of a glacier or ice sheet.
medial moraine
, A moraine formed when two advancing
valley glaciers come together to form a
single ice stream, forms in the middle of
the glacier
moraine that forms along the side of a
lateral moraine
glacier
What is important about a terminal Helps show how fast and where certain
moraine? glaciers flowed
A plain formed of glacial sediment de-
What is an outwash plain? posited by meltwater outwash at the ter-
minus of a glacier.
from the flow of meltwater in front of or
How/why does a outwash plain form?
beneath glacier ice
material deposited by a glacier & left be-
What is glacial till?
hind.
What are fiords? steep, narrow, "drowned" glacial valleys
How has the North American continen-
Created dams which has caused water
tal glaciation affected drainage patterns
to move in different directions
across the continent?
What drives the alternating cold and
change in earth's orbit around the sun
warm cycles
The process by which a glacier picks up
Plucking
rocks as it flows over the land
The grinding away of rock by other rock
Abrasion
particles carried in water, ice, or wind
An unsorted and unstratified accumula-
tion of glacial sediment, deposited direct-
till
ly by glacier ice. made up of CLAY SAND
and BOULDERS
a long, canoe shaped hill made of till and
Drumlins
shaped by an advancing glacier
melted ice blocks that were left after the
Kettle lakes are caused by
glacier retreated