Why are the Inner Planets composed mostly of rock and the Outer Planets composed mostly of
gas?

When the solar system was forming, all planets, both inner and outer planets, in the beginning had nearly identical proportions of hydrogen and helium gases as well as rocks in their cores. The proto-planets that would become Mercury, Venus, Earth, and Mars probably had the same thick atmospheres as the Jovian gas giants.

However, when fusion started up in the Sun, it is thought that a massive "seismic" explosion started from the Sun's core and blew outwards. This formed a wave of concussion that blew away the thick gas atmospheres of the inner planets much like a candle's flame is blown off its wick when you make a sudden puff.

The inner planets were stripped bare down to their rocky cores and only formed a secondary atmosphere once radioactive heat and volcanic activity ignited their cores to force volatile gases to the surface. Jupiter, Saturn, Uranus, and Neptune were too far away for this concussion wave to blow away their thick atmospheres so they still have them today. Some of the escaping gases could have been captured by the outer planets, making them slightly bigger than they originally were.

I know it's a lot but I didn't know how to summarize it in the best way...Good Luck!

what is the novel plz take a picture

given the fact that the question is about the detail that best support the idea that oppressive leaders use   propaganda to achieve thir goals,   the first option does not refer to any kind of propaganda, since it only tells about that the milk and the windfall apple should be reserved for the pigs. in the second option, that is, "snowball and napoleon sent out flights of pigeons whose instructions were to mingle with the animals on the neighbouring farms, tell them the story of the rebellion, and teach them the tune of "beasts of england". it can be identified that the oppressors make use of the propaganda, which is represented by the pigeons, and the information they have to tell other animals about what was happening in the farm in order to get their objectives. for that reason, the right answer is the second option, taking into account that the third option do not refer to propaganda since it only talks about that they did not want jones back. and, finally, the last option refers to the result of the given news, but it does not mean about the propaganda they used to achieve their goals.