TEST YOUR KNOWLEDGE Answers on Page 40
Robert G. Font, CPG-03953
rgfont@cs.com
1. In our studies of glacial environments, what do we mean by an arête? a) An oval, asymmetrical hill of glacial drift indicative of the direction of movement of the ice sheet. b) Winding ridges of glacial drift deposited by streams flowing through tunnels in the ice sheet. c) A knife-edged ridge connecting two or more peaks and separating adjoining cirques. d) No cold glaciers for me, hombre; bring on the heat!
2. In these bivalves, the shells are found on the upper and lower surfaces of the organism. a) Pelecypods. b) Theropods. c) Brachiopods. d) I eat and digest bivalves, dude; I don’t study them.
3. In terms of weight-volume relationships, the volume of the voids divided by the total volume defines: a) Void ratio. b) Water saturation. c) Porosity.
d) Man, the weight-volume relationship that I know about is that the more you weigh, the more volume you are bound to occupy.
4. Silica content is inversely proportional to the viscosity of a magma: a) True. b) False. c) True or false? Dude, are you getting soft with these questions or what?
5. Consider a thick, horizontally-lying, isotropic and homogeneous layer of uncon- solidated sediment at the surface.
Recall that from the Mohr-Coulomb criterion we may write:
NØ = tan2 (45o + Ø/2) and P1 = P3 NØ + 2C NØ1/2 And, let:
PV = vertical stress = P1 = major principal stress; Ph = horizontal stress = P3 = minor principal stress; P2 = intermedi- ate principal stress = P3; Ø = angle of internal friction of the sediment; γ = unit weight of the sediment; Z = depth; C = cohesion.
From these conditions, at what depth (Zo) will the value of the horizontal stress (Ph) be zero?. a) (2Cγ) * NØ1/2 b) (2C/γ) * NØ1/2 c) (γ/2C) * NØ1/2 d) I spoke too soon, dude!
38 TPG •
Apr.May.Jun 2019
www.aipg.org
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