Author Question: How are sand dunes formed? What will be an ideal response? ... (Read 73 times)

Brittanyd9008 · **on:** Jul 29, 2018

How are sand dunes formed?

What will be an ideal response?

Question 2

Blowing sand in a sand dune, settles

A) on the windward slope of the dune.
B) on the leeward slope of the dune.
C) on surrounding mounds of vegetation.
D) in the wind shadow of the leeward slope.

ricroger · **Reply #1 on:** Jul 29, 2018

Answer to Question 1

Answer: Sand dunes form when airflow is blocked by an obstacle such as a rock or clump of grass. As the wind sweeps over this obstacle, wind speed decreases and sand grains fall out of the air and are deposited in the wind shadow. As more sand falls, a mound forms which further blocks the flow of air. With more sand and more wind a dune forms.

Answer to Question 2

Answer: D