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es rica en

is rich in

→ ser
phrase Uncommon #20,272
is rich in Used to say that a feminine noun contains or has a large amount of something, such as nutrients or resources. The adjective agrees with the noun: es rico en for masculine singular nouns and son ricas en for feminine plural nouns.
SP: Esta fruta es rica en vitamina C.
EN: This fruit is rich in vitamin C.

China es rica en recursos naturales.

China is rich in natural resources.

La palta es rica en grasas.

Avocado is rich in fats.

Australia es rica en recursos naturales.

Australia is rich in natural resources.