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.
Egypt has a mixed economic system which includes a variety of private freedom, combined with centralized economic planning and government regulation.
Answer
Permeable rock strata or sediment that transmit groundwater freely are called aquifers.
I think earthquakes or volcanoes.
The correct answer is J. Arab-Israeli wars.
Explanation
The conflict between Israel and Palestine is a social and armed conflict that originated at the beginning of the 20th century. However, this confrontation became more acute after the end of the Second World War since the partition of what had been the British mandate in Palestine was approved, assigning about 7% of the lands of Palestine to the Jewish people. This triggered the expulsion of two thirds of the Palestinian population to different parts of the planet, especially to surrounding countries such as Jordan, Lebanon, Saudi Arabia, Qatar, Oman, among others. So the correct answer is J. Arab-Israeli wars.
