Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means change in form. The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 Â°C) and pressure (1500 bars), causing profound physical and/or chemical change.extures are separated into foliated and non-foliated categories. Foliated rock is a product of differential stress that deforms the rock in one plane, sometimes creating a plane of cleavage. For example, slate is a foliated metamorphic rock, originating from shale.
Thereâs no time limit for how long the period of consultation should be, but the minimum is: 1  20 to 99 redundancies-the consultation must start at least 30 days before any dismissals take effect. 2  100 or more redundancies-the consultation must start at least 45 days before any dismissals take effect.
For I-9s the requirement for retention is three (3) years or one (1) year after the employeeâs termination, whichever is greater. For OSHA records the retention period may go from 5 years for the OSHA 300 log to 30 years for the records of exposure to cancer causing agents. So as you can see there is no one set time frame. The unfortunate result of there being no one certain answer is that HR departments have a tendency to keep everything forever.