Homework Results Will Be Checked During the Next Class

Homework 1

Geology 3265

Name ______

Homework results will be checked during the next class.

A. Calculations

1.  A new crack separates two layers of sandstone that dip toward your house at 34 degrees. Rainwater has gotten into the crack, so you are worried. The upper slab weighs mg = 300000 Newtons = 300000 kg-m/s2. Your experiments show that the static friction force Ff for the wet sandstone surface is 150000 Newtons. Will the upper slab slip and flatten your house? Show all work below:

Notice the angle b is the same as the dip.

a.Write down the expression for the sine of b

b. Solve it for the downhill component of weight F0

c. Plug in the values and calculate F0.

d. Compare Friction Ff to downhill force F0. Will it slide?

B. Admin stuff

2.  Send an e-mail to using an address you check daily. THE SUBJECT LINE MUST BE GEOL 3265. I will use this address for announcements and to answer questions.

3.  Get the text, any edition. You need it; I can’t go over everything.

C. Definitions. Define all terms as you encounter them. I’ll list them for this lecture, just this once:

4.Basaltic, andesitic, rhyolitic; shield, strato- or composite and cinder cone volcanoes; cone, crater,caldera, lava dome, neck, dike, sil, pyroclastic, tuff; arête, col, horn, talus, ice cap, cirque, tarn, valley glacier, moraine, plucking, frost wedging; zone of accumulation, ablation, terminus; roche moutonnée, hanging valleys, main trunk, u-shaped valley; waterfall, v-shaped valley, plume, uplift, base level, ash; headlands, sea arch, sea stack, tides, tombolo, longshore current; pointbar, cutbank, mid-channel bar, oxbow, incised meander; tsunami; delta; Mass wasting, slope failure, basal sliding.

D. Match the terms. The History of Geomorphology

4.  Herodotus _____ a. marine sediments on land, sedimentation slow.

5.  Aristotle _____ b. dry land, sediments exposed; erosion and deposition.

6.  G. Bauer _____ c. mountains sculpted by weathering and slope failure.

7.  N. Steno _____ d. water most significant agent of erosion.

8.  Werner _____ e. all mountains formed under water as sediment.

9.  G. Cuvier _____ f. catastrophic floods carved Earth’s landscape.

10.  J. Hutton _____ g. uniformatarianism; lithification of detrital sediments

11.  Louis Agassiz _____ h. recognized glacial landforms; Ice Ages Eur & N.Am.

12.  Ch. Darwin _____ i. origin of atolls.

13.  Grove Kl.Gilbert ___ j. proglacial lakes; incised meanders; impact craters moon

14.  Wm.Morris Davis __ k. cycle of erosion, peneplain