Conglomerate is a coarse-grained sedimentary rock. It is a mixture of pebbles of many different sizes and sand all cemented together, mostly made up of quartz pebbles and quartz sand grains.
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How was it formed?
On beaches, river banks and lake shores, sand and pebbles are deposited. They are usually rounded because they have been water-washed. Over time they become buried and compacted by the weight of sediments above them and are cemented together by chemicals dissolved in the water percolating through them.
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