| 56. |
The Palaeozoic era starts at ____ million years ago and ends at ____ million years ago. |
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| 57. |
The plants grown in equatorial regions include |
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| 58. |
The reaction is carbonate and bicarbonate ions with mineral is called |
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| 59. |
The process that may cause physical weathering or mechanical rupture are |
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| 60. |
The process of particle detach ment by moving glacial ice is called |
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