Test sedimentary: QUESTION 1 Compaction will be the most significant lithificati

Question

Test sedimentary: QUESTION 1 Compaction will be the most significant lithification process for which of the fllowing rocks? Conglomerate 1. Arkose Shale QUESTION 2 for classifying detrital rocks iswhereas the primary basis for classifying chemical rocks is Particle shape; trace elements Crystalline structure; Sorting Particle size; mineral composition Sorting; density I polnts QUESTION 3 1. What is diagenesis? The change from a sedimentary rock to a metamorphic rock The weathering of carbonate rock due to dissolution The textural, compositional, and other changes that occur to sediments after deposition The two-stage cooling process that creates porphyritic rocks 1 point QUESTION 4 Which environment would be likely to produce a black shale? Shallow marine bay Swamp Forest Eolian dunes 1. 1 points QUESTION 5 Which minerals are the main constituents in most sedimentary rocks? Calcite and Silica 1. Micas and Feldspars Orthoclase and Plagioclase Quartz and Clay Minerals 1 points QUESTION 6 Which of the following best describes the appearance and composition of a conglomerate? 1.

Explanation / Answer

ANS 1:- Compaction will be the most significant process for shale, because as it is made up of clay size particles compaction binds all those particles srtongly together with least space in between the particles and hence leads to lithification. Option D

ANS 2:- Particle size is the primary basis of classification of detrial rocks i.e on the basis of size they can be divided into sand, mud, clay etc. Mineral composition is the primary basis for classification of chemical sedimentary rocks, because on the basis of the mineral present they can be classified. For Calcium rich rocks are classified as limetsones. Hence Option C is the most appropriate ans.

ANS 3 :- The definition of diagenesis is the textural, compositional changes that occur to sedimentary rock after deposition. Hence option C is the most appropriate ans.

ANS 4 :- Black Shale is most likely to be prodiuced in a swampy environment, because this environment provides anoxic conditions and reduced free carbon most suitable for the production or formation of black shales. Option B

ANS 5 :- Sedimentary rocks are mostly made up of Quartz i.e silica, feldspar and rock fragments and clay minerals.So according to the question the most appropriate ans is Option D i.e Quartxz and clay minerals.

ANS 6 :- The definition of conglomerate is that it is a coarse grained sedimentary rock composed of rounded fragments embedded in a matrix of binding substance. Hence option D rounded and well sorted is the most appropriate ans .

ANS 7. Sandy texture is for the detrital sedimentary rocks involving clastic fragments. Hence Option A is the most appropriate ans.

ANS 8 . Shells and Plant fibres are organic substances and hence result in the formation of organic sedimentary rock. Option B

ANS 10. The Poorest sorting is done bt glaciers due to its irregukar flow movement. Option C.

ANS 12:- Limestones composed of calcium carbonate are the most abundant chemical sedimentary rocks. Option D.

ANS 13 :- Igneous rocks are formed by cooling and solidification of lavas, Metamorphic rocks are formed by pressure and temperature change of Igneous rocks, Whereas sedimantary rocks are formed by lithification, compaction and diagenesis of the other two types of rocks. Hence fossils can only be found in the sedimentary rocks. Option B

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.