There's no specific geological term called "erosional mountains." Mountains are formed by tectonic uplift, either from the collision of tectonic plates or volcanic activity. Erosion, however, plays a crucial role in shaping and modifying mountains over time.

Here's how erosion works:

* Weathering: The breakdown of rock into smaller pieces due to forces like wind, rain, ice, and chemical reactions.

* Erosion: The process of transporting weathered material away from its original location. This can be done by wind, water, or ice.

So, instead of "erosional mountains," you might be thinking about:

* Eroded mountains: These are mountains that have been significantly shaped by erosion. They may have rounded peaks, deep valleys, and other features that are characteristic of long-term erosion.

* Mountains with erosional features: All mountains are subject to erosion, so they will have some erosional features. These could be things like canyons, valleys, plateaus, and cliffs.

Here's an example:

Imagine a tall, jagged mountain range formed by tectonic uplift. Over millions of years, wind and rain will erode the peaks, creating smoother, rounded summits. Rivers will cut through the rock, forming valleys and canyons. This is how mountains are constantly being reshaped by erosion.

Therefore, while there's no such thing as an "erosional mountain" in the sense of a specific formation, erosion is a fundamental process that shapes and modifies all mountains over time.