Civilizations first appeared in Mesopotamia (what is now Iraq) and later in Egypt. Civilizations thrived in the Indus Valley by about 2500 BCE, in China by about 1500 BCE and in Central America (what is now Mexico) by about 1200 BCE. Civilizations ultimately developed on every continent except Antarctica
Answer:
"crescendo"
Explanation:
Crescendo is an indication to gradually increase the volume of a song until otherwise noted. A crescendo is marked by a horizontal, opening angle
