Water dominates our lives: we live on a planet with much water and our lives depend on it in many ways. Despite the seeming abundance of water on the planet - with over 70% being salt water - human activity and prevailing climate conditions are placing more pressure on our supply of water than ever before, however. With this pressure comes a need to understand the physical principles of hydrology - the study of the occurrence, movement, and physical properties ofnon-oceanic water on and below...

The Oxford Advanced Learner's Dictionary is the world's bestselling advanced level dictionary for learners of English. Now in its 10th edition, the Oxford Advanced Learner's Dictionary, or OALD, is your complete guide to learning English vocabulary with definitions that learners can understand, example sentences showing language in use, and the new Oxford 3000 (TM) and Oxford 5000 (TM) word lists providing core vocabulary that every student needs to learn. OALD is more than a dictionary.

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