Download How old is our Earth

GLY1010: Introduction to Earth Sciences
Fall 2013 Midterm 1 (40X2.5 = 100 points)
1. Our Universe is ____ years old? *A) 13 Billion B) 4.5 Billion C) 13 million D) 450 Million
2. The most common element in the Earth crust is? A) Silicon B) Iron *C) Oxygen D) Nitrogen
3. Which layer inside our earth is liquid? A) inner core *B) outer core C) Asthenosphere D) all of the above
4. What is the name for the blanket of weathered material on the surface of the earth? A) soil B) A horizon *C)
regolith
5. Why is our earth’s axis of rotation tilted to one side? *A) because of collision with another planet B) because of
gravitational attraction of Jupiter, C) because our earth’s spin is slowing D) because of global warming
6. Which of the following is true? A) No two continents can be on the same plate B) there are about 20 major plates
C) Plates are pieces of crust *D) None of the above is true
7. Rhyolitic volcanoes are found near which kind of plate boundary? A) Transform *B) Convergent C) Divergent D)
All of the above
8. Which of the following is an alkaline soil, typical of desert areas? A) laterite B) Pedalfer *C) Pedocal D) none of the
above
9. As one moves away from the mid-oceanic ridge – the lithosphere gets progressively ________
A) thicker B) denser C) older *D) all of the above
10. Oceanic trenches are characteristic of what kind of plate boundary? A) Transform *B) Convergent C) Divergent
D) All of the above
11. San Andreas fault represents what kind of plate boundary? *A) Transform B) Convergent C) Divergent D) All of
the above
12. Hawaiian volcanoes represent what kind of plate boundary A) Transform B) Convergent C) Divergent *D) none of
the above
13. Reverse magnetized crust at the
X
point X formed during the
________ epoch. A) Brunhes B)
Gauss *C) Gilbert D)
Matuyama
14. East coast of North America represent what kind of plate boundary? A) Transform B) Convergent C) Divergent *D)
none of the above
15. Magmatism in the subduction zone is a result of melting in the mantle due to _________ *A) introduction of
water, B) reduction of pressure, C) increase of temperature D) mantle plumes
16. Which of the following represents a rock sample from the mantle? *A) Peridotite B) Komatitite C) Gabbro D)
Diorite
17. Which among the following areas was the site of a caldera eruption? A) Mt St Helens *B) Yellowstone National
Park C) Hawaii D) Mt Rainier
18. What kind of lava is likely to be found on the ocean floor near the mid-oceanic ridge: *A) Pillow B) Aa, C)
Pahoehoe? D) Flood basalt
19. A cinder cone volcano indicates that the magma was : A) dry B) wet *C) rich in dissolved gases D) cold
20. Agglomerate is a *A) pyroclastic rock made of bombs B) pyroclastic rock made of ash C) pyroclastic rock made
of angular fragments of rocks D) a solidified lava froth.
21. Which of the following kind of eruption is associated with mass-extinction? A) caldera eruption *B) Flood basalt
eruption C) Stratovolcanoes D) Shield Volcanoes
22. The first formed liquid during partial melting is likely to be more *A) felsic, B) mafic, C) of the same composition
as the rock D) can be any of these
23. Pluton in the picture is ….
A) Sill *B) Dike C) Stock D) Batholith?
24. Most common rock-forming minerals are ______. A)
carbonates B) oxides * C) silicates D) sulfides
25. Chlorine (Cl) atom has an atomic number of 17 and mass
number 35. Which of the following is not true about Cl
ion? It has ____ A) 17 proton, B) 17 electron, C) 17
neutron, *D) both b and c
26. Where would one find a Benioff zone? A) above hot spots
*B) along subduction zones C) at the mid-oceanic ridge D)
along a transform plate boundary
27.The type of bonding in Diamond where adjacent carbon atoms share electrons? A) Ionic *B) Covalent C) Mixed
D) None of the above
28. Atoms with same number of protons but different numbers of neutrons ? A) Cations B) Anions C) Ions *D)
Isotopes?
29. Bauxite is a mineral belonging to —group? *A) Oxide B) Sulfide C) Phosphate D) Sulfate
30. Where would chemical weathering be most extensive? A) Steep mountain side with thick soil B) Steep mountain
side with no soil or vegetation cover C) Flat Valley floor with no soil cover *D) Flat Valley floor with thick soil
cover.
31. Breaking of rocks along parallel sheet like layers is known as ____ A) Spheroidal weathering *B) exfoliation C)
Frost wedging D) None of the above
32. Which of the following events indicate an impending volcanic eruption? A) Change in the composition of gases
coming out of hot springs and fumeroles B) swarms of tiny earthquakes C) increase in the tilt of the slopes of the
volcano *D) All of the above
33. Arrange the following rocks according to their resistance to chemical weathering (least resistant to most resistant)
1: Gabbro, 2: Granite, 3: Quartzite, 4; Limestone A) 2,3,14 B) 1,2,3,4 *C) 4,1,2,3 D) 3,4,1,2
34. Massive volcanic mudflows are known as _____ A) Tsunami B) Pyroclastic Flow *C) Lahar D) Flood basalt
35. Which soil horizon is known as the zone of accumulation? A) A *B) B C) C D) None of the above
36. Humus in a soil is mostly______ A) partially weathered bed rock *B) decomposed plant material C) China clay D)
materials leached from the top soil
37 The process of Frost wedging______A) produces sinkholes B) is a type of physical weathering C) cracks open a
rock due to freezing of water in a fracture *D) both B and C
38. Feldspars are what kind of silicate A) Single Chain B) Double Chain C) isolated* D) framework
39. Which of the following is not a mineral? A) Rock salt, B) ice, C) gold nugget, *D) coal
40. Which among the following minerals cannot be scratched by finger nail but can be scratched by an iron knife? A)
Topaz B) Quartz C) Talc *D) Calcite
41. Mafic magmas have higher _________ compared to felsic magmas. A) viscosity B) silica *C) melting point D)
Aluminum
42. What was the name of the ocean that opened up when Pangaea split into a northern and a southern continent?
A) Panthalassa B) Mediterranean *C) Tethys D) Gondwanic ocean