Complete the following statements about maps: i. The outer line surrounding a map is called the _. ii. A map reader uses the to interpret map symbols. iii. The helps a map user calculate the distance

Here are the completed statements:

i. The outer line surround the map $\boxed{\text{Frame}}$
ii. A map reader uses it to interpret map Symbols $\boxed{\text{Key}}$
iii. Help a map user to calculate the distance between two points $\boxed{\text{Scale}}$
iv. It introduce a map to a Map user $\boxed{\text{Title}}$