Geology Chapter 14 – Flashcards

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question
Which of the following is NOT a factor in how shorelines are affected from the water side?
answer
source of detrital sediment for beaches
question
When the sun and moon are aligned so their gravitational forces are added together, this effect causes _________________ tides.
answer
Spring.
question
The vertical distance between a wave crest and trough is called the ________________.
answer
Wave height.
question
Water below the _________________, which is roughly equal to ½ the wavelength, will not be affected by waves passing overhead.
answer
Wave base.
question
The _____________ zone contains turbulent water from breaking waves.
answer
Surf.
question
Which of the following is true about how waves form and break upon the shore?
answer
waves begin to change when they reach water shallower than the wave base
question
One reason why promontories erode more quickly than bays is because incoming waves bend or __________________ inward due to the shape of the seafloor.
answer
refract.
question
Currents that move sediment roughly parallel to the shoreline are called ____________________.
answer
Longshore current.
question
When sea arches collapse, they can leave behind a knob of rock called a __________________.
answer
Sea stack.
question
A ___________________ forms when a sandbar completely seals a bay off from the open ocean.
answer
Baymouth bar.
question
In what direction does a spit typically grow with time?
answer
in the same direction as a longshore current
question
Manmade features that try to control the erosion and deposition of sediment along the shoreline include [a] , which are parallel to the shore and can cause the beach in front of them to erode, and [b] , which are built perpendicular to the shoreline and are meant to trap sand on the up-current side but can cause erosion on the down-current side.
answer
A. Sea walls B. Groins
question
The process of _______________________ adds sand to beaches, but may not last long and is very expensive.
answer
Beach nourishment.
question
What is probably the least expensive approach for avoiding shoreline hazards?
answer
forbid the building of houses or other structures in high-risk areas
question
What does LIDAR measure?
answer
Elevation of land.
question
Which of the following does NOT affect the potential hazards of a shoreline?
answer
the source of beach sand
question
_______________ coastlines occur when there is relative drop in sea level or uplift of land.
answer
Emergent.
question
Which of the following most likely indicates a submergent coastline?
answer
an irregular coastline with branching estuaries and embayments
question
Which of the following would cause sea level to rise?
answer
a decrease in the amount of glaciers on land faster rates of seafloor spreading a rise in the temperature of the oceans
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