Danish Research Center To Explore Mysteries of Earth's Interior

An anonymous reader writes "The DanSeis Centre at the University of Copenhagen has just received a grant of more than €3 million from the Danish Ministry of Science, Innovation and Higher Education to investigate and tackle one of geoscience's great mysteries: do mantle plumes, hypothetically buoyant regions of heated mantle material rising towards the earth's surface, actually exist?"

Comments

What about the discontinuity of gravity?

[UnknownSoldier]

Why is the force of gravity at the core zero?
http://en.wikipedia.org/wiki/File:Earth-G-force.png
http://en.wikipedia.org/wiki/File:Slice_earth.svg

And why the hell is there a Gutenberg discontinuity where gravity increases the closer you get, then drops down to zero?
i.e.
The Gutenberg Discontinuity, is the boundary, as detected by changes in seismic waves, between the Earth's lower mantle and the outer core about 1800 miles below the surface. It is also called the core-mantle boundary.
http://en.wikipedia.org/wiki/Mohorovi%C4%8Di%C4%87_discontinuity

Re:What about the discontinuity of gravity?

[jlar]

"Why is the force of gravity at the core zero?"

Because the integral of the forces acting on some mass at the center of the Earth is zero. Or to put it differently: You are being pulled by (approximately) equal forces in all directions.