which is correct? will mark brainliest for all 3

Answer:
1) Longitude
2)Prime Meridian
3) The Equator
Explanation:
Hope this helps you as much as intended. (couldn't see the third option on Question 3, but I tried to give you the most logical option)
Answer:
1. longitude
2. Prime meridian
3. Prime equator
Explanation:
Hope this helps