gravity separated them by density, iron in the center water and gasses on the outside.
No. They do not have enough gravity to hold on to the gasses.
Hydrogen and Helium
Gravity is a friend of a star as it is the force that holds the star together, enabling it to maintain its shape and generate energy through nuclear fusion. However, gravity can also be an enemy of a star when the star runs out of fuel, causing it to collapse under its own gravity and potentially undergo a violent explosion, like a supernova.
Hydrogen and helium are the two lightest gasses. They are produced on or inside the Earth through chemical or radioactive processes. They are the most common elements in the universe, but not found in our atmosphere in significant quantities becuase they escape into space.
gravity separated them by density, iron in the center water and gasses on the outside.
It consists of various gasses held close to the surface of the Earth by gravity. Since it consists of gasses it has no structure, but the weight of the upper (all relative) gasses press down on the lower gasses: compressing them. Thus the pressure increases as you get closer to the surface (actually the center of the planet).
Look up and see if you see a black hole. Using X-rays is a great way to tell, also if you see hot swirling gasses spiraling around a common center of gravity that appears invisible that is also a good indicator
Yes - that's the reason Earth has an atmosphere.
No. They do not have enough gravity to hold on to the gasses.
heleum
An atmosphere is the sphere of gasses (like oxygen)held by a planet's gravity.
gravity
The pressure of the fusing gasses
because all the gravity is not strong enough to keep the gasses in together
They are both natural gasses
Hydrogen and Helium