The ocean is a vast and wonderful place. It covers more of the world than land, almost twice as much! In fact, oceans cover140million square miles of the earth’s surface. Sea’s are smaller than oceans and are usually no more 600 feet deep.
Dolphins are strong swimmers. Most ocean dolphins can swim at speed of 15 miles per hour. When dolphins want to find food, they make clicking or whistling noises. These noises travel through the water and bounce off objects, like fish or squid. They come from the first fish which lived 500 million years ago!
Swimmers can protect themselves from shark attacks. Some divers experimented with diving suits made of metal to protect themselves from sharks. But larger sharks can bite right through metal.
I like dolphins, but not sharks.