a. The sands uncovered by the low tides

b. A Tidal phenomenon in which the leading edge of the incoming tide forms a wave (or waves) of water that travel up a river or narrow bay against the direction of the river or bay's current.

c. Area of the sea shore or shore of water body which is exposed to air at low tides and water at high tides

d. Difference between the height of water at low and high tides