Explanation:
State Date (admitted or ratified)
1 Delaware December 7, 1787 (ratified)
2 Pennsylvania December 12, 1787 (ratified)
3 New Jersey December 18, 1787 (ratified)
4 Georgia January 2,
(Pennsylvania)answer
They give more/additional information about a certain topic of research.
They help learns to know what they may expect to see on the field
Answer: For example, when you go to the beach, the waves hit the rocky shore, causing it to weather or chip off. There is salt on those rocks, but when the waves hit those rock it weathers it away and thats how we have a salty ocean.
Hope this helped!