QUESTIONS:
1. Are the layers still horizontal, or are they folded?
2. Did one set of layers slide over the rest?
3. How could you use the same apparatus to find out what happens when sands and sandstones are stretched?
4. How do folds and faults form?
5. How did a model help explain the different forces that the Earth's crust experiences?
Answers & Comments
Answer:
1. Sedimentary rocks are important for
deciphering the geologic history of a region because they follow certain rules. First, sedimentary rocks are formed with the oldest layers on the bottom and the youngest on top. Second, sediments are deposited horizontally, so sedimentary rock layers are originally horizontal, as are some volcanic rocks, such as ash falls. Finally, sedimentary rock layers that are not horizontal are deformed in some manner. Often times looking like they are tiling into the earth.
You can trace the deformation a rock has experienced by seeing how it differs from its original horizontal, oldest-on-bottom position. This deformation produces geologic structures such as folds, joints, and faults that are caused by stresses.
2.The activity described uses layers of fine sand and flour which behave like layers of rock. Pupils should appreciate that faulted rocks at the Earth's surface contain clues about the ancient pressures which deformed them. Large scale pressures acting within the lithosphere are caused by plate tectonic movements.
3.by putting the vertical board at the centerof the layer
4.When the Earth's crust is pushed together via compression forces, it can experience geological processes called folding and faulting. Folding occurs when the Earth's crust bends away from a flat surface. ... Faulting happens when the Earth's crust completely breaks and slides past each other.
5.The terrestrial model is the most likely explanation on the formation of the Earth's crust. This model explains that the crustal origin of the Earth was due to its internal processes. ... Another possible explanation was that the melted upper mantle rose up the surface to form a crust.
Explanation:
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