Clastic Sedimentology And Petrography-quiz 1- Jan 2018
30 Questions
| Total Attempts: 278
Questions and Answers
- 1.At high wind velocities silt- and clay-sized particles are carried as bed load.
- A.
True
- B.
False
- 2.Grain roundness is therefore a characteristic that can easily be seen in hand specimen using a hand lens, or will be evident under the microscope if a thin-section is cut of an aeolian sandstone
- A.
True
- B.
False
- 3.A lagoon is the marine-influenced portion of a drowned valley.
- A.
True
- B.
False
- 4.Sediment supply to the estuary is from river sources only and the processes that transport and deposit this sediment are a combination of river and wave and/or tidal processes.
- A.
True
- B.
False
- 5.Difference between estuary and delta is that a delta retrograde inwards into the lake or sea. A estuary all the sedimentation occurs in the drowned valley
- A.
True
- B.
False
- 6.An estuary developed in an area with a large tidal range and weak wave energy will typically have three divisions.
- A.
True
- B.
False
- 7.Bay head delta: Is the zone where fluvial processes are dominant
- A.
True
- B.
False
- 8.An estuary is a body of salt water separated from the deeper sea by a shallow or exposed barrier beach, sandbank, coral reef, or similar feature.
- A.
True
- B.
False
- 9.The Bernoulli effect can best be explained by considering flow of a fluid (air, water or any fluid medium) in a tube that is narrower at one end than the other
- A.
True
- B.
False
- 10.In cross-section wave ripples are generally symmetrical in profile, laminae within each ripple dip in both directions and are overlapping.
- A.
True
- B.
False
- 11.Wave ripples are formed only in relatively shallow water in the absence of strong currents, whereas current ripples may form as a result of water flow in any depth in any subaqueous environment.
- A.
True
- B.
False
- 12.Lavas are found close to the site of the eruption, but ash may be spread tens, hundreds or even thousands of kilometres away.
- A.
True
- B.
False
- 13.Basaltic magmas tend to form volcanoes that produce small volumes of lava, but large amounts of volcanic ash
- A.
True
- B.
False
- 14.Volcanoes with more silicic magma are much more explosive, with large amounts of the molten rock being ejected from the volcano as particulate matter
- A.
True
- B.
False
- 15.•Calcium carbonate (CaCO3) is the principal compound in limestones.
- A.
True
- B.
False
- 16.There is a chemical difference between calcite and aragonite.
- A.
True
- B.
False
- 17.Cherts are fine-grained siliceous sedimentary rocks made up of silt-sized interlocking quartz crystals (microquartz) and chalcedony, a form of silica which is made up of radiating fibres a few tens to hundreds of microns long.
- A.
True
- B.
False
- 18.Sediments and sedimentary rocks with a high proportion of organic matter are termed carbonates because they are rich in carbon.
- A.
True
- B.
False
- 19.Fusain: bright, shiny black coal that usually breaks cubically and mostly consists of woody tissue.
- A.
True
- B.
False
- 20.Volcaniclastic sediments These are the products of volcanic eruptions or the result of the breakdown of volcanic rocks.
- A.
True
- B.
False
- 21.If all the clasts are of the same material (all of granite, for example), the conglomerate is considered to be polymict
- A.
True
- B.
False
- 22.Siltis a textural term to define the finest grade of clastic sedimentary particles, those less than 4 microns in diameter.
- A.
True
- B.
False
- 23.When clay- and silt-sized particles are mixed in unknown proportions as the main constituents in unconsolidated sediment we would call this material shale.
- A.
True
- B.
False
- 24.Feldspar is the most common mineral seen in silt deposits
- A.
True
- B.
False
- 25.Montmorillonite minerals can not absorb water within their structure.
- A.
True
- B.
False
Questions: 15 | Attempts: 273 | Last updated: Mar 22, 2022
-
Sample QuestionThe processes responsible for changing sediments into the sedimentary rock are compaction and
Questions: 15 | Attempts: 183 | Last updated: Mar 21, 2022
-
Sample QuestionGravels (including pebbles) are pieces of older rock material greater than .
Questions: 50 | Attempts: 83 | Last updated: Mar 21, 2022
-
Sample QuestionOne of lake lakes a body of water of 2 hectares (5acres) or more in area; however, others have defined lakes as waterbodies of 5hectares hectares (12 acres) acres) and above, or 8 hectares (20 acres) and above.
Back to top