The inner core; outer core; mantle; and crust
the core is the most dense because it has all the other layers pushing on it.
A Different Answer:
Scientifically, the Lithosphere is the least dense because it has no pressure from other layers against it. It is the crust and the upper mantle.
The Asthenosphere is known as the "weak sphere" and it is under the Lithosphere which has more density from the pressure.
The Mesosphere is the middle sphere. It is the stronger lower mantle. It is under the Asthenosphere and the Lithosphere. It has even more density.
Under that is the outer core, which is liquid iron and it is 2,200 Km thick (very, very thick).
Lastly there is the inner core, which is the most dense of all with all of the other layers pressing against it!
If you want to make all of the info I have listed easier/simpler here it is:
The crust, the mantle (67% of Earth's mass) and the core, made mostly of iron and other dense materials.
The layers of the sun, from the center outward, are the core, the radiative zone, the convective zone, the photosphere, the chromosphere, and the corona.
Most do not. Stars about 10 times more massive than the sun or larger will explode. Smaller stars shed their outer layers gradually.
The three layers of the Sun's atmosphere are the photosphere, the chromosphere, and the corona. The photosphere is the visible surface where sunspots are found. The chromosphere is a thin layer above the photosphere where solar flares occur. The corona is the outermost layer of the Sun's atmosphere, extending millions of kilometers into space.
tropic of cancer
The vast majority of the Sun's energy escapes into space.
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photosphere
The Photosphere
Chromosphere and corona
The photosphere
Sunspots
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The corona, the suns atmosphere.
Fart
Chromosphere A + LS.
The layers of the sun, from the center outward, are the core, the radiative zone, the convective zone, the photosphere, the chromosphere, and the corona.
"The core is made of hot, dense gas in the plasmic state"