Understanding Estuaries Quiz

What is an estuary?

• A mountain range

• A type of desert ecosystem

• A partially enclosed coastal water body where freshwater mixes with saltwater

• A fully enclosed freshwater body

Why are estuaries often called the 'nurseries of the sea'?

• They are the largest water bodies on Earth

• They are protected areas for young marine life to develop

• They are places where birds build nests

• They are the main source of freshwater

Which of the following is NOT a habitat type found in estuaries?

• Sandy beaches

• Seagrass beds

• oil-field canals

• Mangrove forests

What economic value do estuaries provide?

• They are used for mining precious metals

• They support tourism, fisheries, and recreational activities

• They are the main source of global oil production

• They are primarily used for agriculture

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How do estuaries help in environmental protection?

• They block sunlight from reaching the ocean

• They cause soil erosion

• They filter out sediments and pollutants

• They increase air pollution

What role do wetland plants in estuaries play?

• They act as natural buffers absorbing flood waters

• They increase the salinity of the water

• They decrease biodiversity

• They cause more frequent storms

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What is a major threat to estuaries?

• Excessive rainfall

• Decreasing human population

• Lack of sunlight

• Increasing concentration of people in coastal areas

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Which of the following is a consequence of urbanization near estuaries?

• Improved water quality

• Increased fish populations

• Increased pollution from runoff

• Decreased sedimentation

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What happens when water flows through wetlands in estuaries?

• It becomes more polluted

• It loses all its nutrients

• It evaporates completely

• It gets filtered and becomes cleaner

Which of the following is a benefit of estuaries?

• They provide no economic benefits

• They serve as harbors and ports for shipping

• They are not important for wildlife

• They are only used for scientific research

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