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bedrock (Geography Dictionary)

bedrock : The solid rock in the Earth’s crust that underlies all soil and other loose material; the rock material that breaks down eventually to form soil

_ ស្វែងរកឬបកប្រែពាក្យផ្សេងទៀតនៅប្រអប់នេះ៖
ឯកសារការងារនិងរៀនគ្រប់ប្រភេទ៖​
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