Solve these clues to fill the grid.
- Burrowing marine mollusk living on sand or mud
- 2 Across
- The land along the edge of a body of water
- 5 Across
- A porous mass of interlacing fibers that forms the internal skeleton of various marine animals
- 6 Across
- The aggregate of small plant and animal organisms that float or drift in great numbers in fresh
- 9 Across
- The periodic rise and fall of the sea level under the gravitational pull of the moon
- 11 Across
- A nonmetallic element belonging to the halogens
- 12 Across
- Large brown seaweeds having fluted leathery fronds
- 13 Across
- A mass of small bubbles formed in or on a liquid
- 1 Down
- The shore of a sea or ocean
- 2 Down
- Huge body of salt water
- 3 Down
- A flow of electricity through a conductor
- 4 Down
- A division of an ocean or a large body of salt water partially enclosed by land
- 6 Down
- A warm ocean current that flows along the equator from the date line and south off the coast
- 7 Down
- A succession of notes forming a distinctive sequence
- 8 Down
- The periodic rise and fall of the sea level under the gravitational pull of the moon (plural)
- 10 Down