Part 1-: The type of fossil preservation is dependent on the characteristics of
ID: 109728 • Letter: P
Question
Part 1-:
The type of fossil preservation is dependent on the characteristics of the rock in which it is formed. Mudrocks are unique in their ability to preserve:
a) soft tissues.
b) casts of insects.
c) blastoids.
d) bones of large animals.
e) plant roots.
Part 2-:
Which of the following is/are TRUE:
a) mechanical weathering increases surface area so that chemical weathering can take place more easily. b) oxidation and reduction are chemical reactions that involve the loss or gain of electrons. c) exfoliation is typical of layered limestone. d) water is a major player in chemical weathering only. e) both a and b are correct.Explanation / Answer
PART 1:
The type of fossil preservation is dependent on the characteristics of the rock in which it is formed. Mudrocks are unique in their ability to preserve:
ANSWER: [D] Bones of large animals.
EXPLANATION: Mudrocks are fine grained sedimentary rocks consisting of silt and clay fragments. Fossils can be preserved well in mudrocks due to fine grained rock particles can protect them. Most famous mudrock formation is BURGESS SHALE where the hard fossils like bones,teeth and skeleton of over 500 million years are preserved in Burgess Shale because of its UNIQUE ABILITY to preserve due to the protection of mudrock.
PART 2:
Which of the following is/are true?
Answer: [E] Both A and B are correct.
Explanation: A) Mechanical weathering increases surface area so that chemical weathering can take place more easily. Because the breaking down of rock into SMALLER PIECES in mechanical weathering occurs which increases the surface area.
B) Oxidation and reduction are chemical reactions that involve the loss or gain of electrons. Because oxidation occurs when reactant LOSES electrons and reduction occurs when reactant GAINS electrons.