Beaches

Question 1

When do beaches fomr

Answer 1

constructive waves deposit sediment on the shore

Question 2

What are berms and how do they form?

Answer 2

Ridges of sand and pebbles found at high tide marks.

Formed by deposition of coarse material at the limit of swash

Question 3

What are runnels and how do they form?

Answer 3

They are grooves in the sand running parallel to the shore.

Formed by backwash draining to the sea

Question 4

What are cusps and where do they develop?

Answer 4

Crescent-shaped indentations that form on beaches of mixed sand and shingle.
They develop where waves break parallel to the beach and where there’s a large tidal range