Question 1 Folding is an example of _____ behavior. Question 2 Folding is most l

Question

Question 1

Folding is an example of _____ behavior.

Question 2

Folding is most likely to occur in which geologic setting?

Question 3

_____-type orogenesis was responsible for forming the Appalachian mountains.

Question 4

Under what conditions is folding more likely to occur than faulting?

Question 5

What type of fold is illustrated below?

Question 6

Below is a geologic map showing rocks of various ages. Focusing on the eastern part of the map, the oldest rocks are "Dev'n" and get progressively younger (Miss, Penn) to the youngest rocks labeled "Jur."

What type of fold is this?

Question 7

Compression, tension, and shear are all examples of _____.

Question 8

The map below shows the topography of the Atlantic Ocean and parts of North America and Africa (among other locations). Why won't the islands within the Atlantic accrete onto the edges of either continent?

Question 9

Continents grow outward by the addition of crustal components known as _____.

Question 10

Where on Earth would you expect to find the oldest rocks?

Explanation / Answer

Answer 1: Plastic.

Explanation : Folding is an example of ductile/plastic behavior where the deformation is permanent.

Answer 2: Subduction zone.

Explanation : Most of the fold mountains occur along the collisional or convergent plate boundaries where two plates are pushed together or crash onto each other along the subduction zones.

Answer 3: Collisional.

Explanation : The Appalachians were formed due to collision between North America and Africa during the late Paleozoic.

Answer 4: warm temperatures over long periods of time.

Explanation : Folding is most likely to occur under high temperature and pressure conditions(compressional forces) and the deformation must be applied slowly so that the folds can form.

Answer 5: Anticline.

Explanation : The rock beds or limbs in the given figure is dipping away from each other and away from the center of the structure. Hence it is an anticline.

Answer 6: Syncline

Explanation : In the figure, the youngest layer (Jur) occurs at the core of the fold and syncline is a type of fold which is concave up with the youngest layers at its core and progressively older layers outwards.

Answer 7: Stress

Explanation : The force applied to a rock which results in its deformation is known as stress. There are three types of stress:

Answer 8: Because the mid Atlantic ridge is a divergent boundary.

Explanation : Islands accrete mostly along the convergent boundaries and because the Atlantic is a divergent boundary along which sea floor spreading occurs, the islands within the Atlantic do not accrete onto the edges of either continent.

Answer 9: Accretionary prisms.

Explanation : A slow process by which continents grow outwards is by the formation of accretionary prisms during subduction. They pile up along the edge of the continental lithospheric plate at the junction of the two plates.

Answer 10: in the centermost portion of a continent.

Explanation : The oldest rocks are found in the stable interiors of continents known as cratons.

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