Essentially All the Elements Heavier Than Iron in Our Galaxy

question 51

Multiple Choice

Essentially all the elements heavier than iron in our galaxy were formed

• A) by supernovae.
• B) during the formation of black holes.
• C) by fusion in the cores of the most massive main-sequence stars.
• D) during the formation of planetary nebulae.

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Definitions:

Federal Government

A system of government where power is divided between a central (national) government and various regional governments, often seen in countries with a federalist structure.

Research and Development

The investigative activities a business or government undertakes to improve existing products or procedures or to lead to the development of new products or procedures.

Average Surface Temperature

The mean temperature of the Earth's surface, calculated over specific time frames and geographical areas, indicating trends in climate change.

Carbon Dioxide Levels

The concentration of carbon dioxide gas in the Earth's atmosphere, an important measure due to its effects on global climate and warming.