Sorry, please do elaborate on what it is you are talking about, I am all but lost
Igneous rock is formed when magma hardens
Pretty sure you're a person called Dylan
The Mekong river is one of the primary landforms in the South-east Asian peninsula wherein it stretches 4,200 km from Southern Cambodia to the north of Myanmar. In addition, the river system has been the source of transportation as well as fisheries in settlements surrounding it. The country where the river is not its primary water system would be Vietnam.