What are some interesting phenomena in nature?

There are many interesting phenomena in nature, including:

Sunrise and sunset: Sunrise and sunset are astronomical phenomena. Every morning, the sun rises above the horizon and gradually becomes brighter, illuminating the whole world. In the evening, the sun slowly descends from below the horizon and finally disappears behind the horizon. This phenomenon shows the movement of the sun and the rotation of the earth.

sea waves: sea waves refer to waves on the sea surface, which are generated by the action of wind and the movement of sea water. The formation of ocean waves is the result of the interaction of wind force and the depth, temperature and salinity of seawater.

aurora: aurora is a light phenomenon caused by the collision of particles in the sun. Aurora is produced when particles from the sun collide with particles in the earth's atmosphere. Aurora is a beautiful natural phenomenon, which can be observed in polar regions.

raindrops: raindrops are composed of water droplets and are an important part of the weather system. The formation of raindrops is caused by the drop of temperature and the increase of air pressure. Raindrops are formed when water vapor condenses into water droplets in the atmosphere.

double shadow: double shadow is an optical phenomenon, which is caused by two objects in the same light source.