Why is the western part of lake balkhash composed of fresh water, while the eastern part is composed of salt water pls HELP!

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. 

If u make mistakes on a school trip to knotts like standing up on a ride too early and they ask you not to do it again or and if you do it again you will be escorted out will it go on my student record? yes i know it is a dumb question

Which city area has the most accessible oil reserves a) caspian sea b) siberia c)arctic coast d)lake baikal