36. What is the significance of mantle xenoliths? A. They tell us about the comp

ID: 802060 • Letter: 3

Question

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

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

xenoliths are foreign rock materials that are incorporated into magma during its journey towards the earth surface

37) A nonconformity

38)The Devonian

39)The Jurassic

40)The Archean

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