please download to view more efficiently because there are A LOT of transitions and animations to consider before viewing ( it looks like pictures rest on the text because the text flies onto the screen, moves away and the pictures fall in ) , again for my projectwork for geography class

2. Sand dunes are small ridges or hills of sand
found at the top of a beach, above the
usual maximum reach of the waves.
 Dunes form where constructive waves
encourage the accumulation of sand, and
where prevailing onshore winds blow this
sand inland. There need to be obstacles—
for example, vegetation, pebbles and so
on—to trap the moving sand grains. As the
sand grains get trapped they start to
accumulate, starting dune formation.


3. oAt low tide, deposits of sand in
the inter-tidal zone (between the
high and low tide marks) may be
exposed and start to dry. The dry
grains of sand can then be
transported by the wind (by
saltation).
oWhen the dried sand reaches the
top of the beach it can be trapped
by debris such as driftwood, dead
seaweed or rocks and pebbles
oIf the sand is not eroded again it
may become colonised by small
plants, or trap other windblown
debris, increasing its size and thus
trapping even more sand.
oAs the dunes grow in size they
are able to catch more of the sand
blown across them by the wind.
o. Firstly the roots bind the sand
together, and secondly the above
ground vegetation traps particles
of sand as they are blown over the
surface.

4. Interestingly, dunes
move slowly. This
occurs when the
wind lifts sand up on
the windward side
and the sand falls
down on the
leeward side.
In this picture, the wind is blowing from right to left
and sand is therefore carried from the windward
side of the sand dune, to the leeward side:
Hence, the sand dune would move or migrate over
time.

5. Florida Beach, Sand
Dunes and Sea Oates
northwestern Florida
coast of Gulf of
Mexico
Wooden path over the sand
dunes to the blue sea and
fluffy white clouds at
Swansea.
Cronulla Dunes, Kurnell
Peninsula, New South
Wales, Australia.
Greatstone, USA

6. PRESENTATION BY DAISY
SOWAH,
THANK YOU FOR YOUR TIME