It is also used in the production of shortening and margarine. There is evidence of both vowel shortening and lengthening. However, even this bread is often heavily fortified with lard, shortening or butter. It can also be used as a healthier alternative for oil, shortening, or butter. Reverse faults indicate compressive shortening of the crust. Thrust tectonics is associated with the shortening and thickening of the crust, or the lithosphere. Muscle contraction consists of the simultaneous shortening of multiple sarcomeres. The dirt is mixed with salt and vegetable shortening or fat. This would lead to the telomere shortening described. Perosis (a shortening and thickening of bones) is seen in the skeleton. This results in the shortening, or contraction, of the actin bundle (but not the filament). Others recommended shortening the uvula or removing the tonsils. This constriction is caused by the shortening of the sphincter muscle. This could be applied by elongation, shortening, or volume changes, or angular distortion. A significant use of tallow is for the production of shortening.