Sand dunnes

• Sand dunes are mounds of sand that build up on the shore beyond the high-tide mark at the back of the beach.
• • Sand on the beach is dried by the wind.
  • Dry sand is lighter; so, the wind can then blow it inland.
  • The sand becomes trapped by vegetation or other barriers.
  • It then builds up to form sand dunes.
  • Marram grass is sometimes planted on sand dunes to stop the sand blowing further inland.
  • Marram grass has deep roots and is a thick,coarse(thick) grass that Is resistant to salt.(salt causes root damage)
• Sand dunnes