Save guides, add subjects and pick up where you left off with your BBC account. The Earth has a layered structure made up of the core, the mantle and the crust. Different elements are present in ...

Composition of the atmosphere The air ... with around 20% oxygen and other trace gases. The Earth has a layered structure made up of the crust, the mantle, the outer core and the inner core.

Other observational techniques including seismology and in-situ sampling have revealed the structure and composition of planetary interiors (primarily for Earth and its Moon, but soon for Mars as well ...

More than 4,000 naturally occurring minerals—inorganic solids that have a characteristic chemical composition and specific crystal structure—have been found on Earth. They are formed of simple ...

The order of the planets in the solar system, starting nearest the sun and working outward, is the following: Mercury, Venus, Earth ... solar system formed, its structure, and the many fascinating ...