The magma starts cooling and crystallizing. The crystallization cause the magma to change composition. This is referred to as magma evolution.
Molton rock that flows from a volcano onto Earths surface is
Lava.
Magma that flows onto Earth's surface is called lava.
lava
Valcano
it is called lava
Lava ;D
Runoff is the water flowing downhill across the surface of the Earth.
A river is a body of water that travels through a channel in the Earth's surface. It flows in one direction, usually towards the ocean, and plays a vital role in shaping the landscape and supporting diverse ecosystems.
Volcanoes
It could be a spring or artesian well, from which water flows. Or a well in which water seeps rather than flows.
when the water flows over earth materials the earth materials start to increase into a river and it will have lots and lots of meanders in there