Polar easterlies, westerlies, horse latitudes, trade winds, and the doldrums
Tectonic plates are parts (pieces) of the outermost layer of Earth: the Crust. (the outermost part of the mantle is also often included in the plates). This means that the land in the middle of the plates is relatively stable while the borders of the plates can be in movement - after all this is where two pieces meet. Plate borders are where the vocanoes and Earthquakes often take place.
More money started rolling in
Answer is b
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<span> The himilayas are an example of an intervening obstacle, but that is an enviromental obstacle. You could have an economic obstacle such as a town along the way that may be in harsh poverty and you may not be able to continue migrating. Or a political obstacle: Migrating through a country that is ruled under a law that despises something about you like race, gender, culture, or personal status.</span>
