Question

watershed vocabulary term to its definition
river system
estuary
watershed
flood plain
ridgeline (or divide)
tributaries
buffer zones

natural areas that prevent erosion

body of water where fresh water and salt water mix

a river and the streams that flow into it

wide, flat, areas of land near the river

mountains/hills that separate watersheds

the land that water runoff flows across

smaller streams/creeks that feed into a river

Explanation:

River System: A river and the streams that flow into it. This is the combined network of water - ways.
Estuary: Body of water where fresh water and salt water mix. It's the transition zone between river and sea.
Watershed: The land that water runoff flows across. It's the area drained by a river system.
Flood Plain: Wide, flat, areas of land near the river. These areas are prone to flooding.
Ridgeline (or Divide): Mountains/hills that separate watersheds. It acts as a boundary for water flow.
Tributaries: Smaller streams/creeks that feed into a river. They contribute water to the main river.
Buffer Zones: Natural areas that prevent erosion. They protect water bodies from land - based impacts.

Answer:

River System: A river and the streams that flow into it
Estuary: Body of water where fresh water and salt water mix
Watershed: The land that water runoff flows across
Flood Plain: Wide, flat, areas of land near the river
Ridgeline (or Divide): Mountains/hills that separate watersheds
Tributaries: Smaller streams/creeks that feed into a river
Buffer Zones: Natural areas that prevent erosion