![]() ![]() Laboratory experiments indicate that _.Real rocks are not used in laboratory experiments as they are in nature The time of deformation is much shorter in laboratory experiments than in nature The pressures are much lower in laboratory experiments than in nature The temperatures are much lower in laboratory experiments than in nature The biggest difference between rock deformation experiments conducted in a laboratory and rock deformation that occurs naturally is that _.Rocks under low confining pressure are more likely to deform ductily than rocks under high confining pressure Most sedimentary rocks are more deformable than igneous rocks Hotter rocks are more likely to deform ductily than cooler rocks Which of the following statements about rock deformation is false?ĭeep crustal rocks are more likely to deform ductily than shallow crustal rocks.At transform plate boundaries one would expect to find _.At divergent plate boundaries one would expect to find _.At convergent plate boundaries one would expect to find _.The two sides of a fold are called its _.Which of the following is not a tectonic force responsible for folding or faulting rocks?.The angle at which a sedimentary bed is inclined from the horizontal is called the _.What type of forces dominate at convergent plate margins?.What type of forces dominate at divergent plate margins?.Which of the following types of tectonic forces tends to push two sides of a body in opposite directions so that they slide horizontally past one another?.If look at a vertical face of a cliff or a roadcut, you are seeing a _ view of the Earth.If you are flying in an airplane and you look down at the landscape, you are seeing a _ view of the Earth.ĭirection of intersection of the rock layer an a horizontal surfaceĪngle at which the bed inclines from the horizontal Primitive spiny turbots include equal numbers of right- and left-sided individuals, and are generally more symmetric than other families.Multiple Choice Questions for Crustal Deformation - Chapter 15Įach chapter will include a few questions designed to test your knowledge of material covered in the chapter and in the Internet-based resources. In some families of flatfish, the eyes are always on the right side of the body ( dextral or right-eyed flatfish), and in others, they are always on the left ( sinistral or left-eyed flatfish). The most obvious characteristic of flatfish, other than their flatness, is their asymmetric morphology: both eyes are on the same side of the head in the adult fish. Flatfish European flounder, like other flatfish, experience an eye migration during their lifetime, making them asymmetric. Very few species show an even mixture of dextral and sinistral individuals (for example, Amphidromus perversus). A small minority of species and genera have shells in which the coils are almost always sinistral (left-handed). Over 90% of gastropod species have shells in which the direction of the coil is dextral (right-handed). Gastropods īecause the coiled shells of gastropods are asymmetric, they possess a quality called chirality–the "handedness" of an asymmetric structure. Right: The normally dextral (right-handed) shell of Neptunea despecta, a similar species found mainly in the Southern Hemisphere. Therefore, a symmetric object has sinistral and dextral directions arbitrarily defined by the position of the observer, while an asymmetric object that shows chirality may have sinistral and dextral directions defined by characteristics of the object, regardless of the position of the observer.īiology Left: The normally sinistral (left-handed) shell of Neptunea angulata, a species of sea snail (now extinct) found mainly in the Northern Hemisphere. Chirality, however, is observer-independent: no matter how one looks at a right-hand screw thread, it remains different from a left-hand screw thread. Relative direction is from the point of view of the observer a completely symmetric object has a left side and a right side, from the observer's point of view, if the top and bottom and direction of observation are defined. Relative direction and chirality are distinct concepts. Other disciplines use different terms (such as dextro- and laevo-rotary in chemistry, or clockwise and anticlockwise in physics) or simply use left and right (as in anatomy). The terms are derived from the Latin words for "left" ( sinister) and "right" ( dexter). Sinistral and dextral, in some scientific fields, are the two types of chirality (" handedness") or relative direction. Not to be confused with dexter and sinister. ![]()
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