In the scientific method, a theory that is repeatedly confirmed by observations and evidence is called a hypothesis. The interiors of tectonic plates are relatively quiet geologically. A well-sorted sediment is one which has a wide range of grain sizes.
Oolitic limestone is formed by calcification of fish eggs.
In a reverse fault, the hanging wall moves upward, relative to the footwall. Bending of a P-wave at a boundary where the seismic velocity increases is called refraction. Recent tomographic imaging of the earth shows that subducting slabs penetrate much deeper into the mantle than the 700 km earthquake hypocenter limit. Gravity is greater on a mountain top than at sea level, because there is more mass below the observer on the mountain top. The maximum angle at which an unconsolidated material is stable.