Hot dry rock geothermal energy makes use of hot fluids found naturally in basement rock; but such HWR conditions are rare. By far the bulk of the world’s geothermal resource base (over 98%) is in the form of basement rock that is hot but dry—with no naturally available water. This means that HDR technology is applicable almost everywhere on earth (hence the claim that HDR geothermal energy is ubiquitous). Typically, the temperature in those vast regions of the accessible crystalline basement rock increases with depth. This geothermal gradient, which is the principal HDR resource variable, ranges from less than 20 °C/km to over 60 °C/km,
Notes from the Underground (creative writing paper) Sutherland agreed with James that 'everything in the paper is worth reading' but felt the newspaper was pitched too highly compared to other free newspapers. 'It might work, but I think the title is an allusion to the Dostoevsky book Notes from Underground which I suspect would probably go over the heads of most commuters.' However he did add that 'this is a very good platform for new literature, and I am all in favour of it. More power to it, I say.' Notes from the Underground (creative writing paper) Notes from the Underground is a creative writing free newspaper.