I was stuck on this question too. i put silver deposits, and its right because i got a 100 on the quiz.
Migration is moving from one country to another. Massive means large numbers of peopl doing it at the same time.
the massive migration has begun. Birds also show migration to survive.
Gold Rush
It is the massive flood in the Mississippi river
Urban migration was essential to industrialization because of the massive workforce needed to industrialize. Once steam power was used in factories, massive cities formed, as people flocked to factory jobs by the thousands.
There was a massive fortress situated above the Mississippi River
Migration [or trek] of the antelope [or goat] is a literal English equivalent of 'trekbokken'. The phrase refers to the massive migration of the springbok ['gazelle'] when there's extended drought in South Africa, Namibia, and Botswana.
Harder to find jobs?
The Himalayas hindered the migration of people in and out of China. This massive mountain range, with its high peaks and rugged terrain, created natural barriers that made travel difficult and limited interactions between China and neighboring regions.
"Migrate" is a verb that refers to the act of moving from one place to another, typically to find better living conditions. On the other hand, "migration" is a noun that refers to the process or phenomenon of moving from one place to another, often in large numbers.
Two thousand years ago, the Bantu migration was the most massive and important migration since the original humans migrated out of Africa to the rest of the world. Aside from bringing massive population growth, the Bantu brought skills with them that positively impacted the development of the area like metal weaponry, land cultivation and animal husbandry.