1 Slowness-bradykinesia (slow movement) and akinesia (inability to move) are common in people with Parkinson's disease. 2  This is a hypokinetic disorder characterized by hypokinesia or akinesia, rigidity, and a rhythmic fine tremor at the rate of 3-6 cycles per second. Slowness-bradykinesia (slow movement) and akinesia (inability to move) are common in people with Parkinson's disease. 2  This is a hypokinetic disorder characterized by hypokinesia or akinesia, rigidity, and a rhythmic fine tremor at the rate of 3-6 cycles per second.
The conditions deep in the earth are different enough that these different conditions cause minerals different from those which form at the surface. For example, surface weathering process, which is also a change of the types of minerals causes hard rocks to change into small crumbly pieces.
Crystals fracture when they are subject to stress. http://en.wikipedia.org/wiki/File:Sodium... _______________________________________... Ionic compounds almost always consist of metals which are brittle.. Pure metals are malleable and are not very brittle.They are held together by a weaker bond called the metallic bond. You can't judge the properties of compounds by the properties of the atoms that make them up.Look at sodium chloride. Sodium is a highly reactive soft metal. Chlorine is a reactive poisonous gas.ure metals are malleable and are not very brittle. They are held together by a weaker bond called the metallic bond. You can't judge the properties of compounds by the properties of the atoms that make them up.