People who leave their countries because the land had been settled.
<h3>What is a frontier?</h3>
A frontier is the area of Land that is shared by two countries.
It is the border or outskirt of the country which can be occupied by people form the various country. People move here in war time or to search for greener pastures.
Therefore, People moved to the frontier because the land had been settled.
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The answer to the question is A.
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All space junk is the result of us launching objects from Earth, and it remains in orbit until it re-enters the atmosphere. ... Some space junk results from collisions or anti-satellite tests in orbit. When two satellites collide, they can smash apart into thousands of new pieces, creating lots of new debris.
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