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Here is a sentence: the depth of knowledge to be gained from books is richer and broader than what can be learned from direct experience.

Can depth of something be rich and broad?

What is the difference between depth, richness and broadness?

thank u in advance Emotion: smile
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It's a good question, Koldom.

Here's the way I see it: Depth is a term that is appropriately used in reference to a dimension that goes down below a surface. 'Depth of knowledge' should therefore mean knowledge that goes under the 'surface' (as distinct from 'superficial' knowledge). 'Breadth of knowledge' should mean 'wide-ranging knowledge'. 'Richness of knowledge' implies the value of the knowledge. These are three ways to qualify the word 'knowledge'. The author of your quoted sentence might have been better advised to write, 'The knowledge to be gained from books is deeper, richer, and broader than what can be learned from direct experience.'
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You might say that the Pacific had "rich depths", in terms of diversity and density of wildlife. But "broad depths" sounds a little queer, to my ears. We might as well say "tall widths".

If you ask a shop assistant about the relative depths of two freezers, it doesn't help much if he tells you that one is longer than the other.

Where did you find this remarkable sentence, Kolndom?

MrP