Sand dunes can have many shapes and sizes. How is a natural sand dune formed?
A. O Windblown sand piles up on an open beach.
B. Windblown sand is trapped by beach grass or other objects.
C.
Sand is washed up on shore from the ocean and forms hills.
D
Animals push sand into small hills as they burrow along a beach.
Answer: B. Windblown sand is trapped by beach grass or other objects.
Explanation:
Dunes form when wind blows sand into a sheltered area behind an obstacle. Dunes grow as grains of sand accumulate. Every dune has a windward side and a slipface.
