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.
In order to transfer a movie from a PC to a USB flash drive, you  will need to attach the USB drive to your computer. Once you find  the movie file on your PC, you will need â¦ to select the file and  either paste or drag it to the USB drive.5 people found this useful.n order to transfer a movie from a PC to a USB flash drive, you  will need to attach the USB drive to your computer. Once you find  the movie file on your PC, you will need â¦ to select the file and  either paste or drag it to the USB drive. 5 people found this useful.