Name two source regions of mP air masses. What will be an ...

[stevenposner]

Name two source regions of mP air masses.
 
  What will be an ideal response?

Question 2

Geographer E.G. Ravenstein summarized laws of migration in the nineteenth century that have application in today's multinational immigration environment. What are these laws and which law specifically has changed in today's climate.
 
  What will be an ideal response?

[lorealeza]

Answer to Question 1

North Atlantic; North Pacific

Answer to Question 2

Answer: Most migrants relocate a short distance and remain within the same country. Long distance migrants to other countries head for major centers of economic activity. Most people migrate for economic reasons. Most long distance migrants were male. Most long distance migrants were adult individuals rather than families with children. In today's environment one finds a higher number of female migrants and in many cases higher numbers of families, particularly associated with the Syrian refugees.