Question

question 15 of 20 :
select the best answer for the question.

1. whats one indirect consequence of building seawalls?

○ a. it increases the frequency of algal blooms.
○ b. it causes an excess amount of fertilizer to become stuck in the sand.
○ c. it rises the sea level, which infiltrates groundwater aquifers.
○ d. the shoreline habitat is destroyed through loss of sand.
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Explanation:

• Option A: Algal blooms are more related to nutrient runoff (like fertilizers) and water conditions, not directly to seawalls. So A is incorrect.
• Option B: Fertilizer getting stuck in sand is related to agricultural runoff or beach activities, not seawall construction. So B is incorrect.
• Option C: Seawalls don't cause sea - level rise. Sea - level rise is due to factors like climate change (thermal expansion, ice melt). So C is incorrect.
• Option D: Seawalls can disrupt the natural movement of sand along the shore. Without the natural processes (like longshore drift) that deposit sand, the shoreline habitat can be destroyed as sand is lost. This is a known indirect consequence of seawall construction.

Answer:

D. The shoreline habitat is destroyed through loss of sand.