Fine gravel: gravel consisting of particles with a diameter of 2 to 4 mm. Lag gravel: a surface accumulation of coarse gravel produced by the removal of finer particles. Pay gravel: also known as pay dirt; a nickname for gravel with a high concentration of gold and other precious metals.
March 31, 2015. Locate the operating system on your Mac computer using the Apple menu. The Apple menu is found in the top corner of your Mac's screen. Use it to access the About This Mac dialog, through which you can view the version of the OS X operating system currently running on your Mac. Step Click the Apple logo in the top-left corner of your screen to open the Apple menu.
Updated March 10, 2017. Often abbreviated as OS, an operating system is powerful, and usually large, program that controls and manages the hardware and other software on a computer. All computers and computer-like devices have operating systems, including your laptop, tablet, desktop, smartphone, smartwatch, router...