Question

aim
date
the cross - section below represents two types of sorted - sand depositional features found at a coastal location.
cross section of a coastal location

1. which table correctly pairs these depositional features with the agents of erosion that formed them?

the photograph below shows a sandstone butte in an arid region.

1. which agents of erosion are currently changing the appearance of this butte?

a. glaciers and mass movement
b. wave action and running water
c. wind and mass movement
d. running water and glacier

1. which agent of erosion causes the sandblasting of bedrock

a. glaciers
b. wind
c. running water
d. wave action

1. which erosional force acts alone to produce avalanches and landslides?

a. gravity
b. winds
c. running water
d. sea waves

Explanation:

Question 7

Sand dunes are formed by the action of wind (which blows and deposits sand particles). Sand bars are formed by the action of waves (which deposit sediment in coastal areas).

In an arid region, wind (carrying sand particles which abrade the rock) and mass movement (loose material sliding down the slopes of the butte due to gravity - a form of mass movement) are the main agents currently changing the butte's appearance. Glaciers are not present in arid regions (no ice - related erosion). Wave action is coastal - related (not in arid inland regions). Running water is minimal in arid regions.

Wind - blown sand (carried by wind) acts like a blasting material (sandblasting) on bedrock. Glaciers have ice and rock debris (not sand - blasting in the same sense as wind - blown sand). Running water and wave action don't typically cause sandblasting (they have different erosion mechanisms like abrasion with larger sediments or hydraulic action).

Answer:

D. sand dune - wind; sand bar - waves

Question 8