Rich in means containing or having a lot of something. It's used about food (rich in protein), countries and land (rich in oil), and places and texts (rich in history, rich in detail). It isn't about money: rich in shows what there's a lot of.
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rich in + noun (protein, vitamins, oil, history); a country rich in + noun
- Oranges and red peppers are rich in vitamin C, so I add them to my lunch.
- The region is rich in history, with an old castle in almost every village.
- This guidebook is rich in detail, so we hardly needed the internet in Rome.
What changed
First versionLentils are rich of protein, so I often eat them instead of meat.
RevisionLentils are rich in protein, so I often eat them instead of meat.
It's easy to choose of here by analogy with full of. But in this meaning rich goes with in: the protein is, so to speak, inside the lentils.
Rich experience can look like a good phrase for a CV. But a rich experience is a full, memorable experience: Living in Japan was a rich experience. On a CV, describe your work history differently: I have extensive experience in sales.
Your turn
Norway is ___ oil and gas, and that made the country wealthy.
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rich in — The sentence is about what the country has a lot of, and in this sense rich needs in. Rich of comes from the analogy with full of, but it isn't used.
Describe a dish you often cook. Say what it's rich in and when you eat it.
My lentil soup is rich in protein, so I usually eat it after training on Tuesdays.
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