After a long day, I could use a bit of help as my brain is just not working? How would you explain the following to GCSE students: * Why you would expect the percentage of pebbles to be greatest at the bottom of the beach? * Why you would expect the largest pebbles at the bottom of the beach? * Why you would expect the amount of vegetation to increase as you exit the beach and travel inland? (connected to marram grass) Thanks in advance for any help in answering the stupidly easy questions!