| feature -grained or gla… | 0.51 |
| eroded by water | 0.44 |
| break into octagonal an… | 0.40 |
| boast the durability of… | 0.38 |
| add abrasion resistance | 0.38 |
| eroded by wind | 0.35 |
| brown into hematite | 0.30 |
| brown into other iron o… | 0.30 |
| formed on mars | 0.30 |
| formed on venus | 0.30 |
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| pyroxene | 0.64 |
| a strongly magnetic min… | 0.50 |
| olivine | 0.48 |
| feldspar | 0.30 |
| clinopyroxene | 0.30 |
| low radiation | 0.29 |
| fine-grained mineral te… | 0.25 |
| silicon | 0.25 |
| small cavities | 0.25 |
| volcanic rock | 0.81 |
| rock | 0.80 |
| igneous rock | 0.64 |
| extrusive igneous rock | 0.58 |
| the most common volcani… | 0.53 |
| dark-colored, fine-grai… | 0.41 |
| hard, black volcanic ro… | 0.35 |
| common igneous rock | 0.35 |
| mafic darkigneous, extr… | 0.30 |
| 100% volcanic rock | 0.29 |
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| grey to black | 0.60 |
| composed of plagioclase | 0.59 |
| used as crushed stone | 0.56 |
| used in construction | 0.46 |
| cut into dimension stone | 0.38 |
| formed by rapid cooling | 0.38 |
| formed by hardening of … | 0.38 |
| composed of micas | 0.38 |
| composed of amphibole | 0.38 |
| found on the moon | 0.35 |
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