More recently introduced terms such as 'annually laminated' are synonymous with varve. Of the many rhythmites in the geological record, varves are one of the most important and illuminating in studies of past climate change. Varves are amongst the smallest-scale events recognised in stratigraphy.
Computer Randomly Shuts Down: Possible Reasons. If your laptop or computer shuts down by itself randomly, then there can be many possible reasons for it. Knowing the problems due to which your PC keeps shutting down frequently will help you deal with them accordingly. Reason #1: Virus Infiltration.
If Windows inexpicably closes and your PC shuts down, it's almost certainly overheated. The PC, which monitors the temperature of the CPU, is protecting it's delicate circuits from the ravages of heat. (On the other hand, if you PC frequently shuts off without closing Windows first, causing an error message when you next boot, it's likley time to replace the power supply.)