Astronomy/Earth's Layers

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Question
I was wondering what the five layers of Earth are. I also would like to know what those layers are composed of.
Thanks

Answer
The five layers are:
1. The lithosphere - composed of the crust and the uppermost mantle, the hard rocky material near the surface, going down to about 80km below the surface.
2. The Asthenosphere - goes down to about 200 km, made up of mostly solid rock.
3. The Mesosphere (lower mantle) - goes down to nearly 3000 km, where it is made of silicate rocks and where the tectonic plates lie.
4. Outer Core - the liquid layer between the inner core and mantle, and the convection in this area is what causes the Earth's magnetic field.
5. Inner Core - has a radius of about 1200 km, made up of a hot, iron-nickel liquid.  

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Brad Tucker

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I'm happy to answer any general questions about Astronomy, Astrophysics, and Cosmology. I'm also happy to take general, specific, and detailed questions related to supernovae, Baryonic Acoustic Oscillations, the Cosmic Microwave Background, dark matter, dark energy, and the Big Bang Theory. I'm also happy to chat about Astronomy/Astrophysics education and careers, and philosophy and science.

Experience

I am a professional research astronomer/astrophysicist/cosmologist. My research focuses on studying supernovae and using them to measure the properties of the Universe, such as how fast it is growing and what it is made of. I also frequently give talks to school groups and the public, and am a regular guest on various radio stations.

Organizations
Current Research Fellow at Mt. Stromlo Observatory, the Australian National University, and in the Department of Astronomy, University of California, Berkeley.

Publications
Lots of journals, including the Astrophysical Journal, the Astronomical Journal, and Nature. I am currently in the middle of writing my first popular book.

Education/Credentials
B.A. Philosophy, University of Notre Dame, Notre Dame, IN USA B.A. Theology, University of Notre Dame, Notre Dame, IN USA B.Sc. Physics, University of Notre Dame, Notre Dame, IN USA Ph.D. Astrophysics, Mt. Stromlo Observatory, the Australian National University, Canberra, ACT, Australia

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