In the sahara, a place where underground water surfaces is a(n _

Can someone me with this plz? ! i'm putting 20 points on it!

How does central place theory explain patterns in the size and distribution of cities?

What can you learn about precipitation levels in south america from this map? brazil is experiencing a drought.it rains more in higher altitudes.peru received the highest level of rain.venezuela got less than 25 cm of rain.