What are Tides?
Photo Courtesy: overmanwarrior.wordpress.com
Tides are the change in sea level whether it is rising or falling. Tides occur periodically throughout the day around coastal areas. The change in sea level causes the edge of the sea to shift towards the land (flood tide) or seaward (ebb tide) everyday. This could probably answer your question about why your sand castle was destroyed due to the shallow water waves whose speed depends on the depth of the water.
However, it is very important that you have your fair share of knowledge on tides if you participate in coastal activities such as surfing, shell collecting, navigation, fishing, even if you're just walking along the coast, it is imperative that you know the risks factors behind it all. Being trapped in a high tide would be a pity due to one's lack of knowledge. A good question to ask yourself would be "what causes them?"
However, it is very important that you have your fair share of knowledge on tides if you participate in coastal activities such as surfing, shell collecting, navigation, fishing, even if you're just walking along the coast, it is imperative that you know the risks factors behind it all. Being trapped in a high tide would be a pity due to one's lack of knowledge. A good question to ask yourself would be "what causes them?"