The answer is friction. Whenever anything decides to enter our atmosphere, they enter pretty fast, faster than they were in space thanks to gravity. But since they go really fast, they create friction with the gases. Those gases may be flammable and they light up. Then you see that it seems like the meteorite is burning, but actually it's the atmospheric gases around it.
Answer:
If you want to look at it from an academic standpoint then the most valuable fossil is the Holotype; the single specimen that was used to describe a species.
Explanation:
Holotypes are priceless, as they are the single specimen that defines the species.
Materials that make up the crust are less dense and rose to the top.
Sorry I have to type sum random here so I can post a question