The poorest regions of China are generally: A) in the ...

[Themember4]

The poorest regions of China are generally:
 
  A) in the northeast
  B) in the east
  C) in the south and west
  D) around cities on the eastern coast

Question 2

What is the evidence that Mars was warmer and wetter in the past? Why did Mars cool off over time, even though the Sun has become brighter?
 
  What will be an ideal response?

[potomatos]

Answer to Question 1

C

Answer to Question 2

The evidence for a warm, wet early Mars is mostly morphological. Martian channels and what appear to be lake deposits formed during the first 700 million years of Mars's history, indicating that Mars likely had running surface water at this time. Mars has cooled over time because of its low mass. This would have allowed for greater atmospheric loss through escape through the top of the atmosphere, and also would have led to a shut-down of the carbonate-silicate cycle that results from the smaller geothermal energy reservoir associated with a less massive planet.