Quiz #33

22 November 2011

S.I. Session 33 Quiz

This quiz covers material from the lecture on Monday, November 21st.

Part a) Match the term to its definition:

                TERMS:

a) Arête                               b)Lateral Moraine                            c)Plastic

d)Glaciers            e)Retreating Glaciers                     f)Calving

g)Ice Crystals     h)Basal Slip                                         i)Rivers

                DEFINITIONS:

1)__This occurs when glaciers reach the sea and the toe of the iceberg breaks off and falls into the sea.

2)__These flow downhill but the ice front melts back.

3)__This type of glacial flow involves the motion of tiny ice crystals past eachother.

4)__The glacier slides as a single rigid block over a layer of water in this type of glacial motion.

5) __A thin, almost knife-like, ridge of rock which is typically formed when two glaciers erode parallel U-shaped valleys.

6)__ Parallel ridges of debris deposited along the sides of a glacier..

7)__These produce U shaped valleys.

8)__These produce V shaped valleys.

9)__These have an interlocking metamorphic texture.

Part b) Why can ice be likened to sedimentary, igneous, and metamorphic rocks?

Part c) True or False:

                Mark T (true) or F (false) in the blank provided:

                                1)__Solid ice floats in liquid water.

2)__On Greenland, the ice sheet is thickest at the center of the island.

3)__Glaciers cannot form near the equator.

4)__The equilibrium line on a glacier is located where snowfall equals input.

5)__On a continental glacier the ice flows downward and outward from the thickest section.

6)__Glaciers grind, crush, and scratch rocks as they travel.

7)__Sea level doesn’t rise if ice on land melts or slides into the ocean.

8)__The collapse of ice shelves does not increase sea level.