Answer:
Fusion
Explanation:
Supernova Definition:
The supernova occurs after fusion begins to pile up iron in the high-mass star's core. Because iron fusion cannot release energy, the core cannot hold off the crush of gravity for long. In the instant that gravity overcomes degeneracy pressure, the core collapses and the star explodes.
Fun Fact!
Approximately one supernova occurs every second. Supernova happens more often than you might think: One occurs somewhere in the universe every second!
Answer:
The practice of female infanticide.
Explanation:
Some countries, especially China, India, have practiced female infanticide due to the fact that they regard males as superior. As for China an addition factor might have been the one child rule applied for a long time although this law has been relaxed in the last few years and you can now have 2 children. Also, India is well know for female infanticide and women are less valued and the fetus is aborted.
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https://www.economist.com/international/2017/01/21/the-war-on-baby-girls-winds-down
India has cause to fret. According to two demographers, John Bongaarts and Christophe Guilmoto, a staggering 45m girls and women are missing from the country. Some were never born, having been detected by ultrasound scans and aborted. Others died young as a result of being neglected more than boys. Some villages in the north have an alarming surplus of boys and young men. Yet attitudes and behaviour are changing. In India, and in the world as a whole, the war on baby girls seems to be winding down.
Africa and South America's coastlines fit well together
Answer:
Unlike many of these other civilizations, the Greek civilization did not develop in a river valley, but it was surrounded by water. ... Greece is actually a series of islands or archipelagos and peninsulas. These islands and peninsulas were covered with high mountains, making travel by land very difficult.
Explanation:
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