Movements of Ocean Water

Spring tides are caused:

The distance between the earth and the moon is minimum when the moon is in:

The earth reaches its perihelion in:

Visit a lake or a pond and observe the movement of waves. Throw a stone and notice how waves are generated.

Take a globe and a map showing the currents of the oceans. Discuss why certain currents are warm or cold and why they deflect in certain places and examine the reasons.