The scientist who studies processes that change and shape the Earth is called a geologist.

Here's why:

* Geology is the study of the Earth, its composition, structure, properties, and processes.

* Geologists investigate the Earth's history, its rocks, minerals, landforms, and the forces that act upon them.

* They analyze the processes that create mountains, volcanoes, earthquakes, and the movement of continents.

So, in short, geologists are the experts on the dynamic and ever-changing Earth.