Geology

[equalsmcsquared.livejournal.com]

*She is remarkably cheerful for someone who had spent the better part of last week testifying over a rather grisly set of murders, complete with suspected cannibalism.*

I trust you all remembered the papers I assigned. Please stack them next to the roll sheet as you sign in. There are coffee and doughnuts if anyone wants them.

Today, we will be discussing the Earth's magnetic field and how it relates to geology.

The geomagnetic field is generated by electric currents located in many different parts of the Earth. In the outer core the main part of the geomagnetic field is sustained by a naturally occurring dynamo. In the mantle currents can be induced by time-dependent variations in the ambient magnetic field. In the crust the field has both induced and permanent components.

And, in the ionosphere and magnetosphere electric currents are sustained through a complicated interaction with the Sun, the heliomagnetic field, and the solar wind of charged particles. The many different, and sometimes remote, sources of the Earth's magnetic field each contribute to the total field at any one particular location, with the very different physical processes in each domain giving rise to a wide variety of time-dependent geomagnetic variations.

Comments

[sensethevisions]

Phoebe, smiles faintly at Sara and signs in. She hands in her paper and gets to work on the assignment. She really does look like a puppy who has been kicked today.

[pure-blooddraco.livejournal.com]

Draco signs in and hands in his paper. He sits in his chair and begins to do the assignment.

[12parseckessel.livejournal.com]

Han signs in and turns in the paper.

[bridge-carson.livejournal.com]

Bridge bounces in, signs the attendance sheet, and hands in his paper.

[aroseintime.livejournal.com]

Rose wanders into class, signs in and turns in her paper. She waits for lab partner before starting the assignment.

[leeadama.livejournal.com]

Lee comes in to class early, for once, and signs in and hands in his paper. He smiles widely at Ms. Sidle and says, "Good to have you back, professor" before sliding into his seat.

[alchemic-bean.livejournal.com]

Edward straggles in, drops his paper on the stack and finds a seat.

[conathon.livejournal.com]

Sawyer takes a seat after handing in his paper to Sara.

[teen-twin.livejournal.com]

Connor hands in his paper, grabs a cup of coffee, and akes a seat to listen to the lecture.

After Class

[carter-i-am.livejournal.com]

Sam shouldered her messenger bag and stood in the doorway to the classroom. "Excuse me, Professor Sidle?"