Tides

When you visit a beach, sometimes water comes very fast and touches your feet.

And sometimes the water does not come to you so easily.

This happens because of tides.

The rhythmic rise and fall of ocean water twice in a day is called a tide.

Let us try to understand the reason for tides

The Sun and the moon exert a strong gravitational pull on the earth's surface.

When two objects are pulled towards each other due to gravity it is called gravitational pull.

This gravitational pull causes the tides.

There are two types of tides: High tides and Low tides

High tides

High tide is when water covers most of the shore by reaching its highest level.

High tides are caused when the water of the earth is closer to the moon and gets pulled under the moon’s gravitational force.

During full moon day, the Sun, the moon and the earth are in the same line and tides are highest. These are known as Spring Tides.

Uses of high tides

High tides raise the water level close to the shores and help the ships to arrive at the harbour more easily.

The high tides also help in fishing. Many more fish come closer to the shore during the high tide.

The rise and fall of water due to tides are used to generate electricity which is called tidal energy.

Low Tides

During the first and third quarter of the moon, the Sun and the moon are at right angles to each other.

So the tide-producing effects of the Sun and the moon cancel each other and the tides are very low. They are called neap tides.

Low tide is when water falls to its lowest level and moves back from the shore.

So next time you head to the beach with your friends or family, remember the power of tides.

Revision

The gravitational pull of the Sun and moon and rotation of Earth cause tides.

There are 2 types of Tides: High tides and Low tides.

High tides are caused by spring tides and low tides are caused by neap tides.

The End