| 16. |
The most important force that provide resistance to particles towards entertainment is |
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| 17. |
The metamorphism which involves the chemical replacement of elements in rock minerals when gases and liquids permute into bedrock is called |
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| 18. |
The magnetosphere becomes unstable during the magnetic storms during a period of |
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| 19. |
The major crops found in Sudan are |
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| 20. |
The movement of particles by rolling, sliding and shuffling along the eroded surface is called |
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