The rare earth materials remain superconductors at about 90 kelvins and below.
Rocks and soil can be referred to as earth materials.
The size of earth materials that can be moved by water depends on how fast the water is moving.
Wind erosion occurs when wind moves pieces of earth materials.
Small pieces of earth material can be rolled along the ground surface by wind.
Sometimes, wind can carry small pieces of earth materials over large distances.
This extends as far as the cohesive earth material of the old dam core.
More earth material was piled to cover all that, with a solitary stone, or stela often put on top.
Economic geology is concerned with earth materials that can be used for economic and/or industrial purposes.
Ca/Ca varies by about 1% among common earth materials.
