The natural process that creates mountains is called "orogeny." This geological process involves the movement and collision of tectonic plates beneath the Earth's surface. When plates converge, they push against each other, causing the Earth's crust to fold and fracture, leading to the uplift of mountain ranges. This process can occur over millions of years, resulting in various types of mountains, such as fold mountains, fault-block mountains, and volcanic mountains. Orogeny is a key factor in shaping Earth's landscape and contributes to the diversity of topography observed around the globe.