GEOLOGY
PALEONTOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A layer is younger than the rocks below it and older than the rocks above it
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Any intrusion or fault is younger than the rocks it cuts through
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Geologic processes that occurred in the past are the same as those occurring today
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layers of sediment will be horizontal if unchanged
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Detailed explanation-1: -The principle of original horizontality states that layers of sediment are originally deposited horizontally under the action of gravity. It is a relative dating technique. The principle is important to the analysis of folded and tilted strata .
Detailed explanation-2: -The principle of original horizontality states that sediment is deposited horizontally. This is sometimes easier to envision with liquids: imagine pouring water into a cup. The surface of the water is perfectly flat-horizontal. If you dump that water into a bowl, the surface remains flat.
Detailed explanation-3: -According to the law of superposition, in horizontal sedimentary rock layers the oldest is at the bottom. Each higher layer is younger than the layer below it.
Detailed explanation-4: -Principle of Original Horizontality Layers of sediment are generally deposited in a horizontal position. Thus, if we observe rock layers that are flat, it means they have not been disturbed and they still have their original horizontality.
Detailed explanation-5: -According to the Principle of Original Horizontality, sediments are deposited horizontally. After they have been transformed into rock, strata may become tilted or folded by various tectonic movements. However, this principle basically states that “tilted or folded layers used to be flat”.