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.
Step 4: Under the Device section, select your USB drive that you want to make bootable, select MBR partition scheme for BIOS or UEFI computers, or GPT partition scheme for UEFI computer depending the type of partition type on your PC.tep 5: In the following screen, you need to select USB device as your media type. To do so, click on the USB device button. And if you want to prepare the bootable DVD, please click DVD instead. Step 6: Next, youâll be asked to select your USB drive.