When you see water at the bottom of the hole, that is a sign you've found Water Table
Water table refer to an area in the ground that are filled with water. Back in the day, before the modern watering system, people get their water supply by digging the ground until they fount water table and build a well around it
C is not a challenge faced by aid organizations
These numbers tell you the absolute location of the city of Beijing.
There are three digits to the answer. You have 6 numerals to choose from for each digit so its 6 x 6 x 6 = 216
