I see you've been having fun with the sand. Thank you for sharing it on the blog!
Now, let's see what have you found out...
You've done a good job analysing the origin of the sand, the shape of your beach and the effect of man structures. And especial congratulations for IES Jaume Almera for their discussion about artificial beaches. You've got it right! On an artificial beach the sand is not so compact. The reason is that the sand has not undergone the selection that natural forces such as wind and waves do. Even having finer sand, the grains are more disorganised, there are more empty spaces among them so the action of the waves will be more effective, making beach faces steeper and taking the sand away.
Hmmm... This is interesting, all of you have similar heaps of sand and the inclination of the beach face is the same except for IES Ramon Berenguer IV. Their sand has similar size, so how is it possible that the beach face is almost flat?
All participating schools are invited to answer on this same post, just press on the 'No comments/comments' link!
Looking forward to your comments, you are doing GREAT!