CELPIP Reading Part 3Reading for Information Practice

A. Tidal marshes occupy low coastal ground that is regularly covered and uncovered by the movement of tides. Their plants tolerate salty water, soft sediment, and changing periods of exposure better than most land vegetation. A marsh survives only while its surface remains within an elevation range that local plants can endure. If the ground becomes too low or too high relative to the tides, a different community begins to replace it. Understanding sediment and plant processes that sustain tidal marshes therefore requires attention to both immediate effects and slower forms of change within the whole connected system.

B. Floodwater entering a marsh carries fine mineral particles and fragments of organic matter from surrounding water. Plant stems slow the current, giving part of this suspended material time to settle on the surface. Repeated tides spread thin deposits across the marsh, gradually adding height between channels and shallow pools. The amount retained depends on water speed, available sediment, vegetation density, and the duration of flooding. For sediment capture during flooding, this wider context prevents one striking feature from being mistaken for the whole story during a quick first inspection.

C. Marsh plants also build soil when roots, stems, and leaves die and become incorporated into wet ground. Dense roots bind loose material and help the surface resist erosion during ordinary tidal movement. Below-ground production can be especially important where incoming water carries only a small supply of mineral sediment. Burrowing animals and decomposition rearrange the developing soil, so the marsh platform is continually changing rather than fixed. Together, these details place sediment and plant processes that sustain tidal marshes within a broader pattern shaped by the surrounding environment over a meaningful period of time.

D. A marsh may fail to gain enough height when water levels rise rapidly or its sediment supply is cut off. Hard barriers along the inland edge can prevent vegetation from shifting to higher ground as lower areas flood more often. Restoration may reopen tidal channels or reconnect rivers that once delivered sediment to the coast. Managers therefore examine both vertical soil building and room for inland movement when planning long-term protection. This combination helps explain why limits, migration, and restoration cannot be understood from one feature alone or from one brief observation.

E. Not given in any of the above paragraphs.