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Crossword clues

Solve these clues to fill the grid.

How tightly packed the matter in something is
6 Across
The aggregate of small plant and animal organisms that float or drift in great numbers in fresh
8 Across
A ditch dug as a fortification having a parapet of the excavated earth
9 Across
Photosynthetic or plant constituent of plankton
11 Across
Organisms that live at or near the bottom of a sea
15 Across
The periodic rise and fall of the sea level under the gravitational pull of the moon (plural)
16 Across
A bottomless gulf or pit
1 Down
The aggregate of actively swimming animals in a body of water ranging from microscopic organisms
2 Down
A rounded elevation
3 Down
A wave that is blown by the wind so its crest is broken and appears ___
4 Down
An underwater mountain rising above the ocean floor
5 Down
An inclination contrary to the strongest or prevailing feeling
7 Down
The taste experience when common salt is taken into the mouth
10 Down
The top line of a hill, mountain, or wave
12 Down
One of a series of ridges that moves across the surface of a liquid
13 Down
The action of ___
14 Down

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