1.   A. It still sometimes gets cold enough to freeze the tidal estuary known as the Hudson River, but icebreakers now keep channels open for shipping.

2.   Above their tidal estuaries, the North Shore rivers are no larger than a good-sized trout stream in the Eastern United States.

3.   He acknowledged that nobody could agree on which wetlands, ranging from prairie potholes to huge tidal estuaries, were truly worth preserving.

4.   Kayak and canoe rentals, sales and tours on a tidal estuary that is ideal for birdwatching.

5.   The river is a tidal estuary.

6.   The restoration of tidal estuaries is a new science.

7.   The rain only was part of the problem, since the Petaluma River is a tidal estuary and high tide, causes more problems.

8.   It flows downhill from a glassy lake to the tidal estuary, bisecting a dense forest.