Geology -- lecture

[equalsmcsquared.livejournal.com]

Good morning. I'm pleased to see that you've survived the zombie infestation. Coffee and energy bars are at the back and if you need any first aid treatment, please speak up. Otherwise, don't forget to sign the roll sheet before you leave. There will be a lab on Wednesday.

Today, we will be discussing the processes of weathering.

Simply put, weathering is the breakdown and alteration of rocks and minerals at or near the Earth's surface into products that are more in equilibrium with the conditions found in this environment. Most rocks and minerals are formed deep within the Earth's crust where temperatures and pressures differ greatly from the surface. Because the physical and chemical nature of materials formed in the Earth's interior are characteristically in disequilibrium with conditions occurring on the surface. Because of this disequilbrium, these materials are easily attacked, decomposed, and eroded by various chemical and physical surface processes.

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[pure-blooddraco.livejournal.com]

Draco walks into class and signs the roll sheet. He helps himself to coffee and an energy bar. He sits down slowly into a chair in the back, trying to cause the least amount of pain possible to his back.

[auroryborealis.livejournal.com]

Rory stumbles in, holding her own coffee, and looking only marginally better than yesterday. She smiles at Draco as she slumps into her chair.