Question

aim. date: the map shows barrier islands in the ocean along the coast of texas. 2. which agent of erosion most likely formed these barriers? a. mass movement b. wave action c. streams d. glaciers 3. which diagram represents a side view of a sand dune most commonly formed as a result of the prevailing wind direction shown? 4. the particles in a sand dune deposit are small and very - well - sorted and have surface pits that give them a frosted appearance. this deposit most likely was transported by a. ocean currents b. glacial ice c. gravity d. wind 5. which diagram best represents sediments with the greatest degree of sorting by size? the block diagram below shows a displacement of rock layers. 6. which process describes the downward sliding of the rock material? a. tidal changes b. glacial erosion c. mass movement d. lava flow

Explanation:

• Question 2: Barrier islands are formed by wave action. Waves deposit sediments (sand, silt etc.) over time to build up these islands. Mass movement (like landslides) is more relevant for slopes, streams deposit sediments in river - deltas etc., and glaciers deposit till (unsorted sediments).
• Question 3: Sand dunes have a gentle slope on the wind - ward side and a steep slope (slip face) on the leeward side. Diagram C shows a gentle slope on the wind - ward side (where the wind is coming from) and a steep slope on the leeward side.
• Question 4: Wind - transported sediments (aeolian sediments) are well - sorted (because wind can only carry particles of certain sizes effectively) and can have a frosted appearance due to abrasion. Ocean currents can sort sediments but not typically with the frosted look, glacial ice deposits unsorted sediments (till), and gravity - transported sediments (like in mass movement) are also often unsorted.
• Question 5: Well - sorted sediments have particles of similar size. Diagram A has particles that are most uniform in size compared to B (has large variations), C (some variations), and D (has larger and smaller particles mixed).
• Question 6: Mass movement is the downward sliding of rock material under the influence of gravity. Tidal changes are related to sea - level changes, glacial erosion is the carving of land by glaciers, and lava flow is the movement of molten rock.

Answer:

1. B. wave action
2. C
3. D. wind
4. A
5. C. mass movement