Why does a star produce its own light and heat?
- Nuclear fission
- Nuclear fusion
- Chemical reaction
- None
Stars are huge celestial bodies made mostly of hydrogen and helium. Heat and light energy produced by the stars are due to the fusion reaction of hydrogen atoms.
Where in the sky would the Pole Star appear to an observer situated on the North Pole?
- At a fixed point on the horizon
- Perpetually below the horizon and invisible
- It depends on the time of the year
- At the zenith (exactly overhead)
The North Star or Pole Star is famous for holding nearly still in our sky while the entire northern sky moves around it. That's because it's located nearly at the north celestial pole
__________ is the migration of health personnel in search of a better standard of living and quality of life, higher salaries, access to advanced technology, and more stable political conditions in different places worldwide.
- Immigration
- Emigration
- Brain Drain
- Mass Exodus
“Brain drain” is a term used to describe the large-scale migration of skilled human capital that causes a country to lose its innovative capabilities and limits its economic growth.
Name the branch of astronomy that involves the origin and evolution of the universe.
- Cosmology
- Meteorology
- Petrology
- Orology
Cosmology is "the scientific study of the large-scale properties of the universe as a whole."
What was the comparative advantage theory of David Ricacrdo?
- When a country can produce a good or service at a lower opportunity cost than another country.
- Pursuit of self-interest, division of labor, and freedom of trade.
- A theory of free-market capitalism directly opposed to government intervention.
- A theory centers on entrepreneurship, knowledge, innovation and technological advancement.
Comparative advantage is an economy's ability to produce a particular good or service at a lower opportunity cost than its trading partners.
