Weather on the same day in March.

Mountains in the fog.

Fall.

Rainbow.

A rainbow is a natural phenomenon. It's related to physics.

Red, orange, yellow, green, blue, indigo, and violet are colors of rainbow. These seven colors are in this phenomenon.

A rainbow may appear after rain. Or in the fog. A rainbow can be double.

At night, people may see the lunar rainbow or moonbow.

Source of image:

https://www.shutterstock.com/image-vector/paper-rainbow-clouds-on-sky-origami-1656638401

Source of image:

https://www.shutterstock.com/image-vector/design-element-watercolor-rainbow-image-309314531

Source of image:

https://www.shutterstock.com/image-vector/rainbows-different-shape-realistic-set-on-309647012

Fog.