Sea Waves are formed on the surface of seas and oceans. Waves are caused by the wind which blows on the seas and the oceans. The more intense the wind, the higher the waves.

Sea waves have graet mobility, because of their great mobility, water particles easily come out of equilibrium and oscillate under the influence of various kinds of forces.

The water stores up the energy of the wind and releases into the surrounding air, which begins the movement of the waves. This is the reason for formation of waves when there is no wind blowing.

source: internet

The height of wave is measured from the highest point on the surface of the sea. The further the wave from the point at which the wind originated, the less its height. Waves move only on the surface of the sea.
Below 200m there is no movement.

Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth. The times and amplitude of tides at a locale are influenced by the alignment of the Sun and Moon, by the pattern of tides in the deep ocean, by the tidal systems of the oceans, and the shape of the coastline.

source: internet

High and low tides

The moon with its own force of gravity act like of a magnet on the waters of the Earth. The gravitational effect of moon causes the rising and falling of the level of the sea, and so high and low tides are formed.

source: internet

Islands

An island is a part of the Earth’s surface which is completely surrounded by water.

Continental islands are joined under the sea to the Continental Crust.

An oceanic island is actually the peak of a mountain or a part of the Ocean Crust, often from an underwater volcano.

Atolls are islands which consist of coral reefs that have formed around the craters of volcanoes which have collapsed. These are found in tropical seas.