ELI5: Explain Like I'm 5

Modern recession of beaches

A beach is like a giant sandbox next to the ocean where you can play and relax. But the beach is changing a little bit nowadays. You know how the water in the bath shrinks when it gets too hot, right? Well, the same thing is happening at the beach, except the heat is coming from the Sun instead of a faucet.

The beach's sand is made up of tiny rocks, shells, and even some plants that have been broken down by the waves and wind over time. These tiny pieces of sand are very light, and when the water from the ocean hits the beach, it washes them away, which is why the waterline moves up and down the beach all day.

Over the years, humans have built things like houses and hotels near the ocean, and sometimes the buildings can get in the way of the water when it moves back up the beach, which means the water can't wash as much sand away. Also, humans sometimes build walls or rocks called seawalls to stop waves from hitting buildings or homes. These structures can stop the sand from getting washed away too.

When beaches lose sand, they become smaller, which is called a recession. The buildings and seawalls that humans build can cause the recession of beaches because the waves can't reach as far up the beach to wash away the sand. It's also not good for the animals that live on the beach, like crabs and turtles, because they need the sand to lay eggs and make their houses.

So, we need to be careful about building things near the beach and taking care of the sand if we want to keep enjoying the beach for many years to come!