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📘 A salt marsh lives between land and sea

A salt marsh is a coastal wetland flooded and drained by tides, usually beside a protected bay, estuary, or lagoon. Its main plants are grasses and other nonwoody plants, not trees. Salt water, fresh runoff, mud, and air meet in the same.

2
lessons
~10 min
to learn
Adults
level
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What you’ll learn

  1. A wetland built by tidesExplain how tidal flooding, salt-tolerant plants, channels, animals, and connected habitats make a salt marsh function.Salt marshes are living tidal networks where plants, mud, channels, and animals exchange water, food, sediment, and shelter.
  2. A marsh has to keep its elevationConnect marsh carbon storage, sediment accumulation, sea-level rise, and restoration choices.A marsh can store carbon and buffer coasts only while its soils, plants, and tidal exchange keep pace with changing water levels.

Questions this course answers

Why are tidal creeks important to a salt marsh?

Tidal creeks connect the marsh surface to the estuary, carrying materials and animals in and out as water levels change.

Why can a salt marsh sometimes keep pace with rising water, and why can it also fail?

Marsh resilience depends on the balance among sediment supply, plant production, root-zone growth, subsidence, storms, and the rate of sea-level rise.

Put this marsh carbon pathway in a sensible order

Plant growth captures carbon first, dead material reaches the sediment, waterlogging can slow decomposition, and a portion stays stored underground.

Grounded in trusted sources

  • NOAA Ocean Service, What is a salt marsh?, https://oceanservice.noaa.gov/facts/saltmarsh.html
  • National Park Service, Salt Marsh - Cumberland Island National Seashore, https://www.nps.gov/cuis/learn/nature/saltmarsh.htm
  • US EPA, About Coastal Wetlands, https://www.epa.gov/wetlands/about-coastal-wetlands
  • USGS, Constraints on the adjustment of tidal marshes to accelerating sea level rise, https://www.usgs.gov/publications/constraints-adjustment-tidal-marshes-accelerating-sea-level-rise
  • NOAA Fisheries, Protecting Coastal Blue Carbon Through Habitat Conservation, https://www.fisheries.noaa.gov/national/habitat-conservation/protecting-coastal-blue-carbon-through-habitat-conservation

Every Wunder lesson is built from real, reputable sources — never invented.

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