OCN Exam #3

How does a sea stack form?

A stack forms when a sea arch collapses, leaving a vertical column of rock offshore.

How is an arch formed along a sea coast?

An arch forms when a sea cave breaks through a headland or where two sea caves coalesce as they erode back due to wave action.

Why does the beach shown in the video look the way that it does during summertime?

Small waves move sand up the beach face and create a wide, sandy beach.

What is the longshore current?

water forced by waves to move along the shore

define coast

where the land interacts with the sea

define shore

zone that lies between low tide and the highest elevation on land affected by storm waves

What is the most obvious difference between summertime and wintertime beaches?

During summertime, there is much more sand on the beach.

Why does the beach in the video look the way that it does during wintertime?

Large waves move sand offshore onto longshore sand bars and create a rocky beach.

How is a cave created in a cliff face along a sea coast?

Wave action erodes areas of weakness in rock in a sea cliff.

In the long term, what do beach drift and longshore current do?

Move sediment parallel to the shoreline

How does the tide cycle affect erosion along a sea coast?

The tide cycle causes erosion to occur at different elevations along a sea coast.

Which way would sediment move if NO beach drift existed?

at an angle to shore

Normally, beaches have the greatest amount of sand on the berm near the end of __________.

summer