| QUADRIC | A curve or surface whose equation (in Cartesian coordinates) is of the second degree. |
| XAXES | Lines used in Cartesian coordinates |
| NEWTONSSECONDLAW | Physical principle whose equation explains the changes in this puzzle's theme entries |
| MAGMA | Hot molten material below the Earth's surface whose three principal types are basaltic, andesitic and rhyolitic (5) |
| XAXIS | Part of graph along which x-coordinate is plotted (1-4) |
| TANGENT | A geometric line or curve that touches another curve or surface at one point but does not intersect it (7) |
| ABSCISSA | In Cartesian co-ordinates, the distance of a point from the vertical axis (8) |
| AXES | Implements found in Cartesian co-ordinate systems (4) |
| TORES | A solid or surface in the form of a bagel or a ring doughnut; a tokamak; the receptacle of a flower such as a daisy; or, in classical architecture, a moulding above a column's plinth (5) |
| SIDE | Long edge, position or surface to the left or right of an area, object or person, as opposed to its top or bottom; a page; a slope of a hill; a team; or, a television channel (4) |
| QUADRATIC | ___ equation, one of the second degree in which at least one term is squared (9) |
| TURNING | Word for a bend, crossroads, curve or junction; the shaping of a vase or other crock in pottery; or, the action or skill of using a lathe (7) |
| BAY | A curve or recess in the shore of a lake or sea |
| COORDINATE | A set of numbers used in specifying the location of a point on a line or surface or in space (2,8) |
| SEGMENT | A section of a curve or part of something. (7) |
| ESTSINUS | There is a bay (or for that matter a curve or fold) |
| LOOP | A figure produced by a curve or a double thread that crosses itself |
| SINU | In a curve, or fold, or hollow |
| MEANDER | A curve or bend in a river (7) |
| SINUS | A curve or hollow part of the body |