Tides

Front

What are tides?

Back

Tides are the regular rise and fall of sea level on the shore.

Front

What Causes Tides?

Back

Gravitational pull of the Moon and the Sun.

Front

Types of Tides

Back

• High tide – water level is high

• Low tide – water level is low

Front

Extreme Tides

Back

During new moon and full moon, the Moon and Sun line up.
This causes extra high tides and extra low tides.

Front

Time Between Two High Tides

Back

There are about 12 hours and 25 minutes between two high tides.
(We can round it off to 12 hours.)

Tides change four times a day (2 high, 2 low).

Front

One High and One Low Tide

Back

Time between one high tide and the next low tide is about 6 hours.

Front

Effect of Tides on Ecosystem

Back

Effects of tides:

Sea creatures get food

Birds find fish

• Clean the shore by moving water
  Boats can't enter or leave harbours at low tide

  High tides may cause flooding in coastal areas