Boulder bank

Word bank:
Nelson, Boulder Bank, Nature, Goats, long finger, Boulders , Waves,
accumulated, eroded, current, long shore drift, rocks.
My plan:
Research information, how was it formed? & why. Well, my topic is
how and why the Boulder Bank was formed.
How? When goats pull out grass to eat, it loosens the rocks and then
when the goats step on the area it pushes the rocks down the hill
making land slides.
Why? The Boulder Bank is built from rock eroded from cliffs to the
north east that get rounded by rolling along the sea bed, pushed by
current and wave action. As the current slows the rocks get dropped
in a row that stretches in a 13 kilometer long finger extending south
from the cliffs. Rocks still roll south along the seabed at about 7.5
meters a year and over 6000 years enough rocks accumulated to
form the Boulder Bank. Today this Boulder Bank shelters Port Nelson.

Minature dictionary:
long finger: Boulder Bank
accumulated: Gathering together; the rocks
eroded: wearing down
current: flow of water; ie long shore drift
sea bed: the bottom of the sea