We choose the South Pole because the atmosphere above the South Pole contains very very little water vapor, much less than the Sahara Desert.
(We; choose; the South Pole; because the atmosphere above the South Pole contains very very little water vapor, much less than the Sahara Desert) (the atmosphere above the South Pole; contains; very very little water vapor, much less than the Sahara Desert)
We the atmosphere above the South Pole
choose contains
the South Pole because the atmosphere above the South Pole contains very very little water vapor, much less than the Sahara Desert
very very little water vapor, much less than the Sahara Desert