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.
Use a USB flash drive or memory card. You can also move files to Surface, by copying them to a USB flash drive or memory card (microSD, microSDHC, or micro SDXC cards all work with Surface) and then adding the files to Surface. Here's how: 1. Copy files onto a USB flash drive or memory card on your other computer. 2.Insert the USB flash drive or memory card into Surface. 3. Tap or click the notification that appears in the upper-right corner of the screen. 4. Tap or click Open folder to view files. File Explorer opens.. Copy files onto a USB flash drive or memory card on your other computer. 2. Insert the USB flash drive or memory card into Surface. 3. Tap or click the notification that appears in the upper-right corner of the screen.