Physical Setting - Science Worksheet (Page 20 of 28) in pdf

Physical Setting - Science Worksheet Page 20

Part C

Answer all questions in this part.

Directions (66–85): Record your answers in the spaces provided in your answer booklet. Some questions

may require the use of the 2011 Edition Reference Tables for Physical Setting/Earth Science.

Base your answers to questions 66 through 69 on the block diagram below and on your knowledge of Earth

science. The diagram represents an igneous intrusion that solidified between some layers of sedimentary rock.

Letter X represents an index fossil in a sedimentary rock layer. The rock layers have not been overturned.

. .

Key

Igneous

intrusion

Contact

metamorphism

(Not drawn to scale)

66 Describe the evidence represented in the diagram that indicates that the shale layer and the limestone layer

are older than the igneous intrusion. [

]

67 The limestone layer is composed mostly of what mineral? [

]

68 Describe one characteristic of fossil X that makes it a good index fossil. [

]

69 The igneous intrusion contains the radioactive isotope potassium-40, which is used in radioactive dating to

determine the age of rocks. State one property of potassium-40 that allows it to be useful in the radioactive

dating of rocks. [

]

[20]

P.S./E. Sci.–Aug. ’15

Physical Setting - Science Worksheet Page 20