Overheat during multicore process

[iceland]

When i fire a process using 100% CPU of all 8 core of my Intel core i7 processor, Laptop, it starts heating up after 5 min, and if i left it, the laptop power off after 20-25 min. If i stop and resume for 10 min and 10 min off, it can continue upto 1-2 hours.
Is it Normal to use all the core like this or i can't take advantage of multiCPU processes.
Is this Abnormal poweroff is damaging my laptop?
Any suggestion of any kind, how to use properly and optimally, in such cases.

[Chloe Taylor]

Go for and provide some sort of cooling at the place where the CPU is placed in, that the only way you are be getting away from this...