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.
1 If one of your computer's RAM modules fails completely, your computer won't even turn on. 2  Most of the time, however, memory fails slowly and will work up to a point. 3  If your system memory is failing, your computer may power on but then freeze, stop, or reboot continuously at some point during Windows startup.