Estuaries Quiz

What is an estuary?

• A deep ocean trench

• A large freshwater lake

• A narrow river channel

• A partially enclosed coastal body of brackish water

(Select all which apply) Identify types of estuaries listed below:

• fjord

• bar-built

• lagoon estuaries

• coastal plain estuaries

Which type of estuary is formed by the drowning of a river valley due to rising sea levels?

• immersed river valley estuary

• drowned river valley estuary

• sunk river valley estuary

• submerged river valley estuary

Which type of estuary is formed by the deposition of sediments carried by rivers?

• tidal estuary

• bar-built estuary

• delta estuary

• fjord estuary

What are Fjords always associated with?

• glaciers

• deep, fast rivers

• bar-built estuary

• highly oxygenated water

What are the three main threats to estuaries?

• pollution, habitat loss, and overfishing

• oil spills, tourism, and dredging

• deforestation, urbanization, and agriculture

• climate change, invasive species, and sedimentation

Which threat to estuaries is caused by excessive nutrient pollution?

• Climate change

• Eutrophication (richness of nutrients in a lake or other body of water , frequently due to runoff from land)

• Overfishing

• Habitat destruction

Which threat to estuaries is caused by the introduction of non-native species?

• foreign species

• exotic species

• alien species

• invasive species

Which threat to estuaries is caused by habitat destruction and alteration?

• Overfishing

• Loss of biodiversity

• Water pollution

• Climate change

What is the importance of estuaries in terms of biodiversity?

• Estuaries are harmful to biodiversity.

• Estuaries are important for biodiversity because they serve as nurseries and habitats for a wide variety of species, including fish, birds, and marine mammals.

• Estuaries only support a limited number of species.

• Estuaries have no impact on biodiversity.