The main vent is the main outlet for the magma to escape. Secondary vents are smaller outlets through which magma escapes. The crater is created after an eruption blows the top off the volcano
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The Mexico–United States barrier (Spanish: barrera México–Estados Unidos), also known as the border wall, is a series of vertical barriers along the Mexico–United States border intended to reduce illegal immigration to the United States from Mexico.
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a and c I think maybe d too but prob not
