A crevasse is a deep crack, or fracture, found in an ice sheet or glacier, as opposed to a crevice that forms in rock. Crevasses form as a result of the movement and resulting stress associated with the shear stress generated when two semi-rigid pieces above a plastic substrate have different rates of movement. The resulting intensity of the shear stress causes a breakage along the faces.
Unfortunately, many cyclists choose to ride their bikes at dark without bicycle head lights or tail lights. This is against the law in most states in the U.S. (Amazingly, Washington, Texas, and others only require a head light and rear reflector.) It is also very dangerous.here are at least two primary reasons for you, a bicycle rider, to use lights at night. 1  First, the front head light illuminates the area in front of you, so you can ride safely, by being able to detect any hazards you approach.
Depends on the state you are riding in. For example, here in indiana its legal to ride without a helmet. But if you are riding and you cross over to Ohio you need to wear a he â¦ met. You will be fined.Furthermore, it is very dangerous, because if you fall off your bike or crash into something it is likely that you hurt your head seriously.ou would not have the missing mirror as an excuse if you have an accident, since it was clear it's missing and would require you to move your head around to see what the mirror normally helps you see. The driver side mirror is usually more important (from a legal stand point) than the passenger side mirror.