A geologist found a sequence of rocks in which 200-million- year old shales were
ID: 282980 • Letter: A
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A geologist found a sequence of rocks in which 200-million- year old shales were on top of 100- million- year old sandstones. Hypothesize how this could happen? Explain how pieces of granite and slate could be found in the same piece of conglomerate? Four elements make up most of the rocks in the Earth's crust. They are: oxygen, 46.6%, silicon, 27.7%, aluminum, 8.1 percent, and iron, 5%. What might you infer from the low amount of iron? Suppose you found a white mineral with a glassy, nonmetallic luster that was harder than calcite. You identify the sample as quartz. What are your observations? What is your conclusion? Identify a mineral with these properties: pink color, nonmetallic and glassy luster, softer than topaz and quartz, scratches apatite, harder than fluorite, has cleavage, and is scratched by a steel file. What Is the mineral name? What is its hardness? Mudflows in the southern California hills are usually preceded by a dry summer and widespread fires followed by torrential rainfall. Explain why. The Himalayan mountains are located on a boundary between two colliding tectonic plates. Would most of the metamorphic rock in that area occur in small patches or wide regions? How do you know? A crystal system depends upon the way the ____ line-up.Explanation / Answer
A. geologist found a sequesnce of rocks in which 200 million years old shales were on top of 100 millionyears old sandstone. Hypothesize how this could happen?
In overturned fold recumbent fold the the fold is overturned and become horizontal. The formations in bottom limb bocme upside down. The younger top formation in upper limb becomes lowest bed in the bottom limb. So the younger 100 million years old sandstone formation is overlaid by 200 millionyears old shale formation
B.Explain how pieces of granite and slate could befound in the same piece of conglomerate.
Conglomerate boulders contain different formations pieces transpirted by rivers and deposited on sea floor. They act as tiem gap between two formations indicate unconfirmity. Conglomerate contains all type of rocks. Sometime they form single boulder becaause of pressure and temperature exerted by weight of overburden strata. Here shale and granite undergone this proces and comacted together as single conglomerrate boulder.
C.Four elements make up most of the rocks in the earth’s crust. They are Oxygen, 46.6%, Silicon, 27.7%, aluminium 8.1% and iron 5%. What might you infer from the low amount of iron?
The earth cust contain less iron because it is heavier than oxygenm silicon and aluminium. The igeneous magma brings first lighter elements first to surfce to form massive batholithic structures in earth crust . The heavier elements comes later as veins and forms gold,copper and iron deposits. So the earth crust has less iron as iron element is heavier.
D.Suppose you found a white mineral with a glassy, nonmetallic luter that was harder than calcite. You identify the sample as quartz. What are your observations? What is your conclusions?
Massive vien deposits in several metres to kilometers length and and several centimeters to metres in width form as reefs or viens on the surface of the earth. These qurtz veins are formed due igeneouse intrusions. Silica is aboundant in magama and lighter in weight they intrude the crust and comes to surface through fualts or fractures and formveins and reefs.
The quartz reef formation indicates there was a igniseous activity below the crust and the lighter silica migrated through weakerzones in the crustand formed quartz reefs.
E.It is a Potassium feldspar called pink feldspar. Its hardness is 6.0 to 6.5
F.In dry summer the the clayey soils heated up,broken and loosen due to hot summer temperature and forest fires. When it rains the surface soil absorbs more water, swells, due to water content.become loose and weak flows as mud flows which cuases landslides.
G.Himalayan mountains contains more metamoprhic rocks. Due to the collision of India and China plate the orogeny taking place leading to mountain building activity. This activity converting even sediments to metamorphic rocks due deformational forces.
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