| A | B |
| geo | earth |
| geode | a hollow shapped stone with crystals inside |
| geography | the study of the earth and the locations of regions and populations and climate |
| geology | the study of the earth including its origin and history |
| geometry | the kind of math that includes shapes and figures |
| geothermal | the earth's internal heat |
| graph | to write |
| calligraphy | fancy cursive handwriting usually found on wedding invitations |
| graphite | lead used in pencils |
| mimeograph | the old fashioned expression for a photocopy machine |
| seismograph | the machine that measures earthquakes |
| stenographer | the person who sits in a courtroom taking notes on a special typewriter that takes shorthand |