Super Sand dunes

Hi so today Room 2 and 3 went to the beach with the Christchurch city council, we got split into classes with each instructor and we learnt about sand dunes and how sand comes on the beach.
it goes like this... It comes from the mountain- Rivers- ocean then the waves push it onto the beach.
There are 4 different type of plants at the beach keeping the sand dunes together and they are - ice plants, Pingou, Spenifex, Marim and there are also some creatures living in the plants and they are- Geckos, lizards, Spiders.
When we were at the beach we had to get into groups of five in my group there were Lily, Jennah, Tallulah, Sophie, Elliott and me, each group had to make there own sand dune out of sand and kinda wreck it because that's what people do like when they run on the sand dunes and do other stuff so what we had to do was with our fingers we pretended that they were people running across the sand dunes.
Then at the end we had to decorate our sand dunes and protect them from wind at that and we got given paths to put on the sand dunes and skiers and green netting for protection and we also had to find stuff to put on it.