TOEFL IBT Reading Practice Questions - TOEFL IBT Reading Section Exam

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Passage: In coastal wetlands, grasses and reeds slow incoming water, causing suspended sediment to settle around plant roots. This gradual buildup can raise the marsh surface and help it keep pace with moderate sea-level rise. When storms remove vegetation or when seawalls block sediment from reaching the marsh, however, the system loses part of its natural repair mechanism. The phrase this gradual buildup refers to:

the construction of seawalls along the coast the increase in storm intensity over time the disappearance of marsh vegetation the accumulation of sediment around plant roots

Correct Answer:

the accumulation of sediment around plant roots

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