Question Video: Describing Primary Geological Structures | Nagwa Question Video: Describing Primary Geological Structures | Nagwa

Question Video: Describing Primary Geological Structures

Which of the following statements best describes a primary geological structure? [A] A structure that can cause a large-scale deformation of Earth’s crust [B] A structure that has formed due to an applied tectonic force [C] A structure that has formed after the deposition of a rock [D] A structure that is associated with tectonic plate boundaries [E] A structure that is nontectonic that forms prior to or during the deposition of a rock

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Video Transcript

Which of the following statements best describes a primary geological structure? (A) A structure that can cause a large-scale deformation of Earth’s crust. (B) A structure that has formed due to an applied tectonic force. (C) A structure that has formed after the deposition of a rock. (D) A structure that is associated with tectonic plate boundaries. (E) A structure that is nontectonic that forms prior to or during the deposition of a rock.

A geological structure is a feature that is found in a rock that has formed due to external factors, such as tectonic forces or environmental processes. Geological structures can be split into primary and secondary. This question focuses on primary geological structures.

Primary geological structures are structures that are formed before or during a rock’s formation. The primary geological structure cross-bedding forms when sand grains are transported by environmental processes, such as wind, fluvial, and marine currents. The sand grains pile up and eventually avalanche down the side of the pile to form a cross bed that is inclined to the bedding plane. Over time, this process repeats and a set of cross beds is formed. These then become lithified and become part of the rock’s structure. Primary geological structures like cross-bedding are nontectonic. This means that tectonic forces have no influence over their formation.

So, in conclusion, a primary geological structure can be described as a structure that is nontectonic that forms prior to or during the deposition of a rock.

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