Runoff
runoff
Runoff
it would be lava , magma is in the ground and flows on earths surface and cools to lava
it flows because if convection currents
Runoff
Runoff is the water flowing downhill across the surface of the Earth.
Molton rock that flows from a volcano onto Earths surface is
Lava.
lava
lava
If you were asking what the fresh water is called that flows across the surface of the land, then your answer would be: Runoff is fresh water that flows along the surface of the ground. It originates from precipitation or melting snow and ends up in rivers, lakes, or oceans. A river. I assume you are asking "why" and not "what". Water, like all other matter on earth, is affected by the earths gravity. Gravity has pulled much of the surface water into large pools, we call oceans, that cover the lowest parts of the planet. Fresh water deposited on land by rain, sleet, snow, and hail will follow this same downward path towards the oceans. So I guess the real answer to your question is gravity.
runoff
Valcano
runoff
Runoff
it is called lava