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Watershed

Across
Drainage area; what this whole exercise has been about
Protective zone
Fast-flowing precipitation from a weather disturbance
Small fish that migrate upstream to spawn
River that runs through Portsmouth, and which connects Great Bay to the ocean
Fast growing simple aquatic plants, usually green
Buildings early setters used to grind flour, cut lumber, and weave cloth
Snake-like fish
Bivalve filter-feeder; also the river that runs through Durham
Result of condensation of water in the atmosphere
Name for our part of the Atlantic Ocean
Introduction of harmful substances into the environment
Hard; water-resistant
Where the river meets the sea
River that runs through Greenland
Byproduct of lumber mills, there is a deep layer of this at the bottom of Great Bay
Fish that usually likes cold water
A key ingredient in animal and plant life, that causes problems if overly abundant
Small loose grains of rock and debris
Natural home
Down
Built by early settlers to harness power of rivers
Where early American mills got their power
Slightly salty
Fresh water river that becomes the Squamscott River
Tidal portion of the Exeter River
River between Dover and Durham
River that runs through Newmarket
One of two rivers that form the Piscataqua River
Matter that settles to the bottom of a river
An essential element for plants, helps build bones in animals
What we all need to do with our natural resources
One of two rivers that form the Piscataqua River
The wearing down of surfaces, frequently by water
Not original; an intruder
Stream that flows into a larger stream
Element essential for human and other animal life
Fish that died out locally when our ancestors built dams on the rivers
The heart of New Hampshire's biggest estuary
Poison
Substance found in ocean water but not in fresh water