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task 4 An aquifer is an underground layer of water-bearing rock. Water-bearing rocks are permeable, meaning that they have openings that liquids and gases can pass through. Sedimentary rock such as sandstone, as well as sand and gravel, are examples of water-bearing rock. The top of the water level in an aquifer is called the water table.
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| 2014-02-04 | nishith | 70.00 | Check this speaking |
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Like there are punctuation marks in essays, same thing in speaking. Need to put those 'punctuation marks' properly.