How do tides work?
The moon pulls the Earth towards it using a gravitational pull.
The water on top of the Earth is not held down by gravity because it is a free liquid and so it is pulled up.
The water at the bottom of the Earth appears to relax as the Earth is also pulled towards towards the moon.
This forms a high tide.
The Earth rotates once each day.
This means that most places on the Earth have two high tides and two low tides.
How are rock pools made?
When the tide is high, the water comes closer and closer to the shore until rocks along our coast are covered by water.
Underneath the water, in the dips and shallows of the rocks, the sea water fills the spaces and brings animal life along with it.
As the tide moves away from the coast and we move towards a low tide, water is left behind in the rock pool.
This gives us a tiny little look at life in the sea.
Rockpools are amazing micro-habitats (small places full of life). They are packed with incredible creatures.
However, because they are shallow and get hit by the sea twice a day, all the creatures need to be tough to adapt to different temperatures and the waves crashing over them.
In the United Kingdom you might be lucky enough to find: