The peaks and valleys of the Earth's surface are caused by the giant tectonic plates of the Earth's crust crashing into each other and the continually wearing forces of weather, water and glacial ice.
(The peaks and valleys of the Earth's surface; are caused; by the giant tectonic plates of the Earth's crust crashing into each other and the continually wearing forces of weather, water and glacial ice) (the giant tectonic plates of the Earth's crust; crashing; into each other)
The peaks and valleys of the Earth's surface the giant tectonic plates of the Earth's crust
are caused crashing
by the giant tectonic plates of the Earth's crust crashing into each other and the continually wearing forces of weather, water and glacial ice
into each other