A blowhole is a natural opening found in coastal rock formations, primarily created by the force of ocean waves. When waves crash against the shore, water is forced into these openings, creating a spectacular spray of water that shoots up into the air. Blowholes are often found in areas with volcanic rock, where the erosion has formed these unique structures. Many marine animals, such as whales, also have blowholes, which are specialized nostrils located on the tops of their heads. These blowholes allow them to breathe while swimming, enabling them to take in air quickly before diving back underwater. The term "blowhole" can refer to both geological formations and the breathing apparatus of these animals.