| A | B |
|---|
| -term- or -termin- | to limit, bound, or set limits to; limit or boundary |
| indeterminate | not precisely determined; vague |
| interminable | having or seeming to have no end; tiresomely drawn out |
| terminal | forming or relating to an end or limit; fatal |
| terminus | the end of a travel route or the station at the end of a route---an extreme point; tip |
| -geo- | Earth |
| geocentric | having or relating to the Earth as the center |
| geophysics | the science that deals with the physical processes and phenomena occurring especially in the Earth and its vicinity |
| geostationary | being or having an orbit that a satellite remains in a fixed position above the Earth |
| geothermal | of, relating to, or using the natural heat produced inside the Earth |
| -spher- | ball |
| stratosphere | the part of the earth's atmosphere that extends from about seven to about 30 miles above the surface--a very high or the highest region |
| biosphere | the part of the world in which life can exist; living things and their environment |
| hemisphere | half a sphere, especially half the global sphere as divided by the equator or meridian |
| spherical | relating to a sphere; shaped like a sphere or one of its segments |
| -vert- | to turn or to turn around |
| divert | to turn from one purpose or course to another; to give pleasure to by distracting from burdens or distress |
| converter | a device that changes something from one form to another |
| avert | to turn away or aside (especially one's eyes); to avoid or ward off; to avoid or prevent |
| revert | to go back or return (to an earlier state)--to be given back to (a former owner) |
