Final answer:
Brackish water is a mix of freshwater and saltwater with a salinity level between freshwater and saltwater.
Step-by-step explanation:
Brackish
Water with a salinity level higher than freshwater but lower than saltwater is called brackish water. It is a mix of freshwater and saltwater and can be found in estuaries, mangrove swamps, and certain coastal areas.
Brackish water typically has a salinity level between 0.5 and 30 parts per thousand (ppt), whereas freshwater has a salinity level below 0.5 ppt and saltwater has a salinity level above 30 ppt.
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