An estuary is a partially enclosed body of water. An estuary is a mixture of what two types of water? What is primarily threatening estuaries? What is a watershed?

Estuaries are primarily composed of sea water and freshwater. Pollution is the prime threat to estuaries. What should also be included is that human actions are a primary threat to estuaries. Whether it's by climate change or by filling, draining, dredging, and other manipulations occurring throughout estuaries. Additionally, estuaries are called home to a diverse collection of native wildlife

A watershed is a a basin where several sources of water collect. These sources of water include rivers streams, runoff, and precipitation.