What is the intertidal zone?

The area between the high tide line and the low tide line that is alternately covered and exposed by water The shallow water area immediately beyond the beach The zone where freshwater rivers meet the ocean Any ocean area that experiences tidal fluctuations

What is an estuary?

A partially enclosed coastal area where freshwater from rivers mixes with saltwater from the ocean An inlet cut off from the ocean by a sandbar A deep coastal channel used for shipping A tidal pool on a rocky shore

Why are mangrove forests ecologically important?

They protect coastlines from erosion, provide nursery habitat for fish, and store large amounts of carbon They primarily serve as nesting sites for seabirds They filter salt from seawater, making it drinkable They are only important as a source of timber

Which organism is characteristic of the intertidal zone and attaches firmly to rocks to avoid being washed away?

Barnacles Jellyfish Tuna Sea horses

Salt marshes and mangroves are described as 'nursery habitats' because:

Young fish and invertebrates find shelter and abundant food in these sheltered, shallow areas Seabirds exclusively nest and raise chicks in these habitats Adult fish lay eggs only in these areas These habitats produce the most oxygen in the ocean

What distinguishes a rocky shore habitat from a sandy shore habitat?

Rocky shores provide hard surfaces for attachment, supporting more diverse fixed organisms like mussels, anemones, and algae Sandy shores have more biodiversity because they are warmer Rocky shores have no life because the waves are too strong Both habitats have identical communities

Why are coastal ecosystems among the most productive on Earth?

They receive nutrients from rivers and land runoff, combined with sunlight in shallow water, fueling high rates of photosynthesis Coastal ecosystems are actually the least productive ocean zones Warm temperatures alone make coastal zones productive Coastal zones are productive because they are far from pollution

What is 'upwelling' and why is it important to coastal ecosystems?

The rising of cold, nutrient-rich deep water to the surface, which fuels phytoplankton blooms and rich fisheries The sinking of warm surface water that delivers oxygen to the deep ocean Tidal waves pushing deep-sea sediment onto coastal beaches A type of coastal flooding caused by storms

Sea grass beds are important coastal habitats because they:

Produce oxygen, provide food and shelter for marine species, stabilize sediment, and store carbon Only serve as feeding grounds for sea turtles Prevent fish from entering coastal waters Form the base of coral reef structures

Why are coastal wetlands — including mangroves, salt marshes, and estuaries — being lost worldwide?

Coastal development, aquaculture, agriculture, and pollution are the main drivers of their destruction Sea level rise is the only cause of coastal wetland loss Coastal wetlands are not being lost — their area is increasing globally Invasive species are the primary cause of wetland decline