GEOLOGY
PALEONTOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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most rocks in the Earth’s crust are layered horizontally
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igneous rocks form essentially horizontal layers
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metamorphic gradients are essentially horizontal before deformation
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sediments are deposited as essentially horizontal layers
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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: -Principle of Original Horizontality, states that sediments are deposited in flat, horizontal layers. Sedimentary particles settling under the influence of gravity in a body of water will deposit horizontal layer of sediment.
Detailed explanation-3: -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-4: -The Law of Original Horizontality suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed. This allows us to infer that something must have happened to the rocks to make them tilted. This includes mountain building events, earthquakes, and faulting.
Detailed explanation-5: -Sedimentary rocks typically occur in horizontal layers called strata. In undisturbed strata, younger layers sit on top of older ones. This is known as the law of superposition. Strata can be cut by other geologic features, such as faults or intrusions.