Lots or thousands of others
Answer:
According to the core accretion model, initially the dust particles and the interstellar gases were all combined together forming a huge cloud, that eventually gets cooled and these gases got concentrated and became gradually denser.
Due to the increasing density, this cloud got disintegrated under the action of gravity, thereby formed a proto-star. Due to the continuous fusion and gravity effects, a star formed and eventually got burst. It then formed the sun with a disk of substances and matter around it. This rotating disc in due course of time gave rise to the planets that exist today.
This is how the solar system originated according to the core accretion theory.
Answer:
Explanation:
It is composed of four principal areas of interest: mean years of schooling expected years of schooling, life expectancy at birth, and gross national income per capita. This index is a tool used to follow changes in development levels over time and to compare the development levels of different countries.
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ANSWER:
Rivers are very important for a country's economy as many trades take place through rivers .
Also many new ideas and comodities spread across the eorld through sea routes .
Also ideas of new technologies,achievements in medical science get across the world through rivers and seas.
Even sometimes some special things that need to taken from one country to another with high security are taken through rivers.
There can be many more reasons for rivers being important for a country's economy.
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