CIRCLEGRAM

Replace the question mark with a letter so that the letters within each circle can be arranged to form words, names or terms on a common theme. What are the three words, and the letter represented by the question mark? Need a little help getting started? Text or call our clueline for a keyword clue. Text ES CIRCLECLUE to 85100. Texts cost £1 plus your standard network charge*. Or call 0901 293 5270. Calls cost £1 plus your network access charge*. Yesterday’s solution: N. Obsidian, Granite, Mudstone, all types of rock.