Corrected sentence: People live on Earth, where towns and villages sit between pretty, sleepy mountains and loud, grumpy volcanoes. Nature feels both beautiful and a bit scary.
This sentence is already grammatically correct. I added a comma after "Earth" to make the sentence flow more clearly because the phrase after it gives extra information about Earth.
- Comma after Earth: Use a comma before "where" when the clause gives extra information (a nonrestrictive clause). It helps the sentence sound clearer: "People live on Earth, where..."
- Adjectives: "pretty, sleepy" and "loud, grumpy" are fine. We use commas between descriptive words when they are coordinate (you could put them in a different order and it would still make sense).
- "Feels" or "is": "Nature feels both beautiful and a bit scary" is correct because it tells how nature seems. You can also say "Nature is both beautiful and a little scary." Both are okay.
Simpler version for age 8: People live on Earth, and towns and villages sit between pretty mountains and loud volcanoes. Nature is both beautiful and a little scary.