The depth of the ocean (or perhaps a very big lake) is measured using ____. The term is also the study of the floor of a body of water (though it sounds more like it's the study of your tub).

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1. The depth of the ocean (or perhaps a very big lake) is measured using ____. The term is also the study of the floor of a body of water (though it sounds more like it's the study of your tub).