Abundance of the chemical elements in the Sun and outer planets is similar to that in the universe. Due to solar heating, the elements of Earth and the inner rocky planets of the Solar System have undergone an additional depletion of volatile hydrogen, helium, neon, nitrogen, and carbon (which volatilizes as methane). The crust, mantle, and core of the Earth show evidence of chemical segregation plus some sequestration by density. Lighter silicates of aluminum are found in the crust, with more magnesium silicate in the mantle, while metallic iron and nickel compose the core. The abundance of elements in specialized environments, such as atmospheres, or
Passing By the Earth should push open that sunlight-uncontaminated yet-to-be constructed city gate and still can find no place to rest</poem> <poem> do you think that your departed face could ever find my unborn pair of eyes?</poem> "Scent Dance I", "Scent Dance II", "Scent Dance III" and "Scent Dance IV" belong to the same catena, which is inspired from Xuntian He’s poem "Passing By the Earth" (1999). Passing By the Earth "Passing By the Earth" is a poem by He Xuntian in 1999. Its chief subject matter is "Every single living human being who encountered the first ray of light of this new century