Army Award for. Maintenance Excellence. The Army Award for Maintenance Excellence award winner displays an expertise and professionalism in performing their tasks. Each unit is evaluated on their effectiveness in ensuring that Soldier competency is maintained.
The pedosphere is the outermost layer of Earth's continental surface and is composed of soil and subject to soil formation processes. It exists at the interface of the lithosphere, atmosphere, hydrosphere and biosphere. The total arable land is 10.9% of the land surface, with 1.3% being permanent cropland.
The outermost layer is called the upper mantle, and goes down to a depth of 410 km. Below that is the the transition zone (660 km), then the lower mantle reaching a depth of 2,891 km. The various layers of the mantle have different types of rocks.