I can't decide whether to use the in these sentences.
[The] white chalk rock underground has formed beautiful hills and valleys.
[The] grassland has a lot of flowering plants.
[The] coastline has a lot of wondeful beaches and cliffs.
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If you are talking about a particular something then the should be used, otherwise the pluralised nouns (in your case) would be more general
The grassland to the east has a lot of flowering plants. (specific)
Grasslands have lots of flowering plants. (general)
If you use the with the plural, the listener will expect you to describe which grasslands (again being specific when using the)
The grasslands of the Serengeti