So some rocks are radioactive because they have radioisotopes in their nuclei. Also they may have radon gas trapped in their crystals if they are igneous rock. They could also be radioactive due to the fact that the atom of the rock is unstable.
Connecting USB Devices Manually. Choose VM > Removable Devices to connect specific USB devices to your virtual machine. You can connect up to two USB devices at a time. If the physical USB devices are connected to the host computer through a hub, the virtual machine sees only the USB devices, not the hub.
Each virtual machineâs files are also stored in a folder on your hard drive, which you can copy to back them up or move them between computers. This is how the Portable VirtualBox allows you to take your virtual machines with you on a USB flash drive and use them on any computer you come across.he operating system installation process is normal, but it happens in a window on your desktop. When youâre done with the virtual machine, you can shut it down or just close the window. When you want to use it again, open the virtual machine program and double-click the virtual machine.