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.
PCs are designed to shut down automatically when heat endangers the hardware. To find out if this is your problem, download and install Speedfan. It's small and free. Although Speedfan's basic job is controlling the speed of your PC's fans (you probably guessed that by the name), it also provides the CPU temperature.
SYMPTOMS. After you click the Shut Down The Computer option in the Shut Down Windows dialog box and then click OK, your computer may stop responding (hang) or display a black screen after you see the Please wait while your computer shuts down screen. Back to the top | Give Feedback.