No
The outer core, inner core, mantle, crust, water, atmosphere. This is the order from densest to least dense.
Yes, an incredibly dense one. Mainly of carbon dioxide it is about 90 time more dense than the Earths atmosphere.
less dense and pressure decreases. Additionally, temperatures can vary depending on the atmospheric layer.
the density and temperature of the layers. The farther you go up, the less dense each layer is.
The thing is, the atmosphere doesn't end abruptly. Rather, it gets thinner and thinner (less dense, to be precise) as you get away from Earth. "Outer space" is often defined as starting at an altitude of 100 kilometers above sea level - or some similar value.
That depends a bit on how you understand "actually". Earth's atmosphere gets thinner and thinner (less dense) as you go away from Earth; at an altitude of about 100 kilometers, you are in outer space (by definition), but the atmosphere can still make satellites slow down. At an altitude of a few hundred kilometers, even that becomes insignificant.
No, the atmosphere of Mars is about 100 times less dense than Earth's. Earth's atmosphere is composed mainly of nitrogen and oxygen, while Mars has a much thinner atmosphere consisting mostly of carbon dioxide.
The Earth's crust is the least dense layer. It is made up of rocks like granite and basalt and is relatively thin compared to the other layers of the Earth.
The air becomes less dense, the higher you go. And generally, the temperature gets colder until you reach the thermosphere, which is the hottest part of Earths atmosphere.
The thinner but more dense crust of the Earth is found beneath ocean basins and is known as oceanic crust. It is made up of dense basalt rock and is thinner than the continental crust. This crust is constantly being formed and destroyed through the process of seafloor spreading and subduction, respectively.
Air becomes thinner at higher altitudes because the pressure decreases as you go higher up in the atmosphere. This means that there are fewer air molecules in a given volume of space, making the air less dense.
of course not titan has a dense atmosphere as well