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Where do freshwater and saltwater mix in coastal regions? A. Lagoon B. Estuary C. Delta D. Confluence
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Step 1
I'll solve this problem step by step, focusing on the key characteristics of where freshwater and saltwater mix in coastal regions.

Step 2
: Understand the Key Locations

Let's examine each potential location where freshwater and saltwater might interact: A. Lagoon: A shallow body of water separated from larger water bodies by sandbars or coral reefs B. Estuary: A partially enclosed coastal body of water where freshwater from rivers mixes with saltwater from the ocean C. Delta: A landform created by sediment deposition at the mouth of a river where it enters a larger water body D. Confluence: A point where two rivers or streams join together

Final Answer

Estuary The estuary is the precise location where freshwater and saltwater mix in coastal regions, creating a unique transitional ecosystem with gradually changing salinity.