G107 Homework 3 Name: 1. Indicate either convergent (C), divergent (D), or trans
ID: 118134 • Letter: G
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G107 Homework 3 Name: 1. Indicate either convergent (C), divergent (D), or transform (T) for each of the following. Some of the terms below may be associated with more than one plate boundary, but only one answer is required Mid-ocean ridge Oceanic trench Chain of volcanoes Mountain range Conservative boundary Volcanic island arc Destructive boundary Slab pull" Rift valley 2. Which of the following in true about spreading centens A. They are the source of new granitic crust B. Most old crust is destroyed where spreading occurs C. They are the source of new basaltic crust D. They are the source of new limestone crust 3. Divergent boundaries are locations of mountain building events A. True B. False 4. What is the global average rate of plate motion? A. 2 feet per year B. 200 inches per year C. 5 feet per year D. 2 inches per year E many miles per year 5. What was the name of the large "supercontinent" that existed about 220 million years ago? A. Pangaea B. Pancakea C. Siberia D. Greaklakea 6. Paleomagnetism records the magnetic field of the earth at the time the rock formed A. True B. FalseExplanation / Answer
1.
(D) Mid ocean ridge. (C) Mountain range (C) Slab-pull
(C) Oceanic trench (T) Conservative boundary (D) rift-valley
(C) Chain of volcanoes (C) Volcanic island arc
(D) Constructive boundary (C) Destructive boundary
2. (C) They are the source of new basaltic crust.
A mid-ocean ridge demarcates the boundary between two tectonic plates diverge from each other. As plate spreading i.e., moving away from each other there is mantle upwelling and production of new seafloor results. The buoyant melt rises as magma at a linear weakness in the oceanic crust, and emerges as lava, creating new crust upon cooling.
3. Divergent boundaries are locations of mountain building events. False
Because most of the mountain building evenes are associated with convergent plat boundaries, i.e., when plates moving towards each other.
4. What is the global average rate of plate motion ?
Ans. D. 2 inches per year.
Because the global average plate motion is 5 tp 10 cm per year.
5. What is the name of the large supercontinent that existed about 200 million years ago ?
Ans. A. Pangaea.
Because during Late Paleozoic to Early Mesozoic the supercontinent Pangaea existed.
6. Paleomagnetism records the magnetic field of the earth at the time of earth formed.
Ans. A. True.
There is certain minerals in rocks which record the direction and intensity of the magnetic field at the time of formation. Paleomagnetism is the study of the record of earths magnetic field within the minerals of the rocks.
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