There is no single, universally accepted "first mountain" on Earth. Mountains are formed over millions of years through geological processes like plate tectonics. Therefore, it's impossible to say definitively which mountain was the very first.

Here's why:

* Continents constantly shift: The Earth's continents are constantly moving and changing due to plate tectonics. Mountains that existed billions of years ago might have been eroded away or changed dramatically.

* Geological processes: Mountains are formed through a variety of processes, like volcanic activity, erosion, and collisions of tectonic plates. These processes have been happening throughout Earth's history, leading to the formation of numerous mountains over time.

However, there are some interesting facts about early mountains:

* Oldest known mountains: Some of the oldest known mountain ranges on Earth are located in Canada and Greenland, with rocks dating back to over 3 billion years old.

* Early mountain formation: The early Earth was a very different place than it is today. The first mountains likely formed due to volcanic activity and meteorite impacts.

Ultimately, the idea of a "first mountain" is a bit of a philosophical question. The Earth has been constantly evolving for billions of years, and mountains are a natural part of that evolution.