This is an archive of CompuServe forum messages from 1985 to 1995, as saved in transcripts by John Foust.
Search Results (4 messages)
Gravity/Earth's Core
Message #171005
Joe, there is no gravity, the Earth … never mind. Some geophysics books have gravity graphs that show the acceleration of gravity as a function of distance from the center of the earth. As you know, g = G*me/r^2 where big G is the gravitational constant and me is the…
Where does this claim of fractional-distillation in magmas come from? Distillation involves vaporization of the "fractionated" material and that doesn't happen in earth temperature processes. Partial melting and fractional CRYSTALLIZATION are processes that take place in the earth within or beneath the crust. In partial melting, the least strongly bonded…
#Earth's core, why hot?
Message #171003
Sorry I can't give you a usable reference, the topic is covered in many general geology texts, though. There were/are three sources of earth heat: 1. The planet accumulated stuff from solar nebula in its early stages of formation between 5 and 4.7 Ga (Gig-annum, billion years) and the kinetic…
Meters? Miles? Huh? Please be careful about your frame of reference, don't mix units. My speedometer is calibrated in furlongs per fortnight and I have a stack of tickets 2.75 cubits thick!