While "Geosphere" is a broad term encompassing all the solid, non-living parts of the Earth, there isn't really a fixed set of four characteristics that define it. However, we can consider some key aspects of the geosphere:

1. Composition: The geosphere is primarily composed of rocks and minerals. This includes:

* Crust: The outermost layer, made of various types of rock like granite and basalt.

* Mantle: A thick layer of mostly solid rock, but behaves like a very viscous fluid over long periods.

* Core: Composed of iron and nickel, with a solid inner core and a liquid outer core.

2. Structure: The geosphere has a layered structure with distinct chemical and physical properties. These layers interact with each other and influence various geological processes.

3. Dynamics: The geosphere is a dynamic system with ongoing processes like:

* Plate tectonics: Movement of large tectonic plates, responsible for earthquakes, volcanoes, and mountain formation.

* Erosion and weathering: Breakdown of rocks by forces like wind, water, and ice.

* Volcanism: The eruption of molten rock (magma) from the Earth's interior.

4. Evolution: The geosphere has evolved over billions of years, with significant changes in its composition, structure, and processes. This evolution is driven by internal and external factors.

In summary, rather than focusing on "four characteristics," we can think of the geosphere as a complex system characterized by its composition, structure, dynamic processes, and ongoing evolution.