Overcrowding and slums developed in many impoverished countries in the 20th century, mostly due to large migrations to cities from people looking for work.
The reason the Indo- European languages dominated the globe geographically today was that <span> 'B) European colonization around the world helped spread the languages.'</span>
The main mechanism through which the layering happened is gravity: it pulled the heavier, denser material to the center, leaving the less dense material on the surface.
The material that was on the outside cooled quicker, but this was the result, not the cause.
The answer is
<span>2) Gravity caused more-dense material to move toward the center of each planet.</span>
Answer:
From looking at a map, I can assume that it's Madagascar.
Explanation:
