When a city becomes too crowded, it can’t provide the resources that the individuals living there need. I didn’t really understand what you were saying, but hope this helps!
I think it’s Mongolia and China. Again I’m not sure so I’m sorry if I got it wrong.
Two ways in which the proximity to water has affected Western Europe's economy:
1) Proximity of water can lead to lack of food, which affects economy of the country in various ways.
2) It has wet cool summers and wet, mild winters, so for shelters and cloths, it affects economy by transportation, extra manufacture etc.
Hope this helps!
Meteor = Space rock
Asteroids= small rocky object
Comets= ball of ice
Planet= travel around starts
Orbital radii= average distance from sun