Answer: The Rocky Mountains
Explanation:
It is the mountain range that divides the west coast of the USA and Canada from the rest of the countries.
 
        
             
        
        
        
Answer:
 Migration boosts the working-age population. Migrants arrive with skills and contribute to human capital development of receiving countries. Migrants also contribute to technological progress. Understanding these impacts is important if our societies are to usefully debate the role of migration
 
        
             
        
        
        
Answer: As altitude increases, atmospheric pressure decreases 
Explanation:
Atmospheric pressure  is defined as the force
 is defined as the force  per unit area
 per unit area  the air that forms the atmosphere exerts on the Earth's surface:
 the air that forms the atmosphere exerts on the Earth's surface:

It should be noted that as the altitude increases less air is above and, therefore the air weights less. This is because the atmosphere losses density as we ascend, causing less air.
However, it is important to point out this decrease in pressure is not linear, since at the beginning (in the first kilometers above sea level) it reduces more rapidly than in the next kilometers above. That is why this relationship between atmospheric pressure and altitude is exponential.
 
        
             
        
        
        
Quaternary period<span>, Cenozoic </span>era<span>, and Phanerozoic </span>eon<span>.</span>