A geologist found a sequence of rocks in which 200-million-year old shales were

Question

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 state 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?

Explanation / Answer

A. It may be due to the total inverted deformation in the firmation or it may be due to the cross bedding process.

B. Slate is a metamorphic rock whereas granite is a plutonic rock. Intrusion of magma into the slate formation can happen.

C. Crust is made up of comparatively less dense material than mentle and core. Thus it is made up of silica, aluminium and magnesium.

D. Lusture of quartz is vitreous. And it is clear and mostly white in color. It has comparatively high hardness scale and resistance.

G. Himalayan metamorphic range started from Main boundary thrust to MCT. it is also present in ITCZ . Thus it may be concluded with wider ranges.

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