This system measures the difficulty of routes on water ice. Elysium quadrangle that contain large amounts of water ice. Snow is precipitation in the form of crystalline water ice. An additional factor in determining the structure of water ice is deposition rate. The mountains are made of water ice. Ganymede is composed of approximately equal amounts of silicate rock and water ice. This hydrogen is thought to be contained in large deposits of water ice. The dielectric constant value was consistent with a large concentration of water ice. Chandrayaan-1 orbiter crashed into Shackleton crater and confirmed presence of Water Ice. The dust may be made of water ice. The criticisms listed here mostly predate the discovery of significant amounts of polar water ice. This process is expected to have created a body consisting mainly of water ice. Nonetheless, materials in both terrains are likely to be rich in water ice. No compound other than crystalline water ice has been unambiguously identified on Tethys. There are significant amounts of water ice in its crust.