| iron | 2 |
| composition | 1 |
| antarctica | 0.61 |
| the desert | 0.41 |
| the united states | 0.38 |
| brazil | 0.38 |
| one place | 0.35 |
| the region | 0.34 |
| the sahara desert | 0.34 |
| namibia | 0.33 |
| oman | 0.31 |
| association | 0.25 |
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| fall to earth | 0.76 |
| hit the earth | 0.71 |
| crash to earth | 0.69 |
| land on earth | 0.62 |
| arrive on earth | 0.61 |
| fall through the atmosp… | 0.57 |
| enter the earth’s atmos… | 0.56 |
| hit the ground | 0.55 |
| found on earth | 0.53 |
| strike the moon | 0.52 |
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| bursts of water | 0.31 |
| plumes of water | 0.25 |
| devastation | 0.24 |
| a shock wave | 0.22 |
| explosion | 0.16 |
| chondrule | 0.46 |
| mineral | 0.42 |
| metal | 0.42 |
| density | 0.38 |
| amino acids | 0.37 |
| composition | 0.35 |
| cyanobacteria | 0.34 |
| water | 0.28 |
| carbon | 0.28 |
| fossilized organism | 0.25 |
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| special care | 0.16 |
| found on earth | 0.74 |
| composed of iron | 0.70 |
| discovered | 0.61 |
| cut | 0.58 |
| composed of nickel | 0.56 |
| sold | 0.56 |
| collected | 0.54 |
| found on mars | 0.52 |
| recovered | 0.49 |
| believed to originate i… | 0.49 |
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