31. Plate motions are measured using: A. Marine magnetic anomalies B. The strike

Question

31. Plate motions are measured using:

A. Marine magnetic anomalies

B. The strike of transform faults

C. Earthquakes

D. The Global Positioning System

E. A and D

32. At which location does rifting of a continent often begin?

A. An ancient transform fault

B. An ancient mid ocean ridge

C. A suture zone

D. An ancient trench

E. All of the Above

33. What is a failed rift?

A. A mid ocean ridge system that stops spreading

B. A mid ocean rift valley that is choked with volcanics

C. A continental rift that stops opening

D. A mid ocean ridge that merges with a subduction zone

E. A and C

34. How did the Appalachian Mountains form?

A. From repeated collisions of continents on opposing sides of the Atlantic

B. From subduction of the seafloor under an arc along the Pacific coastal plain

C. From strike slip transform motion along the rifted east coast margin

D. From doming of the crust at the beginning of the rifting process

E. A and B

35. Which of the following are TRUE?

A. Heat increases with depth

B. Pressure decreases with depth

C. Both A & B

D. Pressure increases with depth

E. A and D

36. What is the significance of mantle xenoliths?

A. They tell us about the composition of the Earth’s core

B. They tell us about the composition of the Earth’s crust

C. They tell us about the composition of the Earth’s mantle

D. They tell us about the composition of the Earth’s lithosphere

E. They tell us that the Earth is made of string cheese

37. What type of unconformity lies above igneous or metamorphic basement?

A. A nonconformity

B. An angular unconformity

C. A paraconformity

D. A disconformity

E. None of the above

38. Which period comes after the Silurian?

A. The Triassic

B. The Permian

C. The Ordovician

D. The Cretaceous

E. The Devonian

39. Which period comes before the Triassic?

A. The Jurassic

B. The Permian

C. The Pennsylvanian

D. The Cretaceous

E. The Silurian

40. Which is the oldest eon?

A. The Archean

B. The Paleozoic

C. The Proterozoic

D. The Mesozoic

E. The Phanerozoic

Explanation / Answer

31)  Marine magnetic anomalies.

marine magnetic anomalies are the patterns in rocks which are produced on either sides of mid oceanic ridge rocks, which change with the the reversals of magnetic fields

32) An ancient mid ocean ridge. it is a place where two tectonic plates move away from each other due to extensional forces

33) A continental rift that stops opening

34) From repeated collisions of continents on opposing sides of the Atlantic

35) A and D

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