What Makes a Mountain 'Alive' or 'Dead'?

Imagine mountains like living creatures, some are young and full of energy, while others are old and quiet. A mountain is 'alive' when it keeps growing because of strong forces inside the Earth. When those forces stop, the mountain becomes 'dead'.

When molten rock from deep underground pushes up through cracks in the ground, new mountains form, like how a cake rises in an oven. These are alive mountains.

Sometimes, mountains stop growing and just sit there for millions of years. They're still around, but they don't change much anymore, like a tree that's stopped growing.