# geology assignment

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Hello,Simply, follow the assignment instructions, and please let me know if you have any question. assignment instructions are on the uploads.Tahnk you.

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Provide accurate answers to all of the following questions. [Scroll down to read the grading scheme (rubric)].
1. A hypothetical rock is going to be analyzed for its radioactive isotope contents, X and Y. X is the parent and Y is the
daughter isotope. Assume that the half-life of the radioactive isotopes is 1,000,000 years. Based on this information,
A) How much of the parent (X) and how much of the daughter (Y) will be present at the time the rock forms? Choose
one of the following (4 points) and explain why (8 points). Total: 12 points.
A) X = 100%; Y = 100 %
B) X = 0%; Y = 100 %
C) X = 100%; Y = 0%
D) X = 50 %; Y = 50 %
B) How much of the parent (X) and how much of the daughter (Y) will be present after 2,000,000 years? Choose one
of the following (4 points) and explain why (9 points). Total: 13 points.
A) X = 75%; Y = 25%
B) X = 50%; Y = 50 %
C) X = 25%; Y = 75 %
D) X = 12.5%; Y = 87.5%
2. The accompanying diagram is a cross section of a hypothetical area. Place the lettered features in the proper
sequence, from oldest to youngest (left: oldest; right: youngest). (25 points)
[ Hint: “Lava flow l” is the youngest rock because it cuts across all other rocks; “A” is the oldest because it is
underneath all other rocks.
Note: You don’t need to write the reason as I did above, this was meant to explain to you the reason why “T” is the
youngest and “A” is the oldest. You just need to place the letters, as indicated at the bottom of the figure ]
2. The accompanying diagram is a cross section of a hypothetical area. Place the lettered features in the proper
sequence, from oldest to youngest (left: oldest; right: youngest). (25 points)
[ Hint: “Lava flow l” is the youngest rock because it cuts across all other rocks; “A” is the oldest because it is
underneath all other rocks.
Note: You don’t need to write the reason as I did above, this was meant to explain to you the reason why “I” is the
youngest and “A” is the oldest. You just need to place the letters, as indicated at the bottom of the figure ]
Lava flow /

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D
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Dike M
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Pluton K
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Dike L
-12

12
Oldest
2014 Pearson Education, Inc.
Youngest

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Geology

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