Speed of light
According to Einstein, the speed of light is constant in all points of reference. In addition, he pointed out the speed of light is the maximum speed known since in practice one can never catch up with the beam of light. This is explained by his theory of relativity.
I believe it’s called Alluvium! It’s where the river mouth is build up of gravel,sand,silt, and clay!!
Honestly I don’t really know in my opinion
