When the weather becomes very hot, the metal roofing sheet expand and in attempt to free themselves from the grip of nails, cracking noise is heard.
Static electricity
pulmonary consolidation
Because of static electricity that discharges when you pull it off.
Crackles: Fine crackling or bubbling sounds, commonly heard during inspiration when there is fluid in the alveoli; also called rales.
Crepitus.Abnormal crackling sounds are called rales when heard on ausculation of the lungs, but called crepitus when heart in a joint, gangrenous skin, etc.
there shpuldn't be any noise
yes,ihave been on the union train station i heard noises when i went to the part of the train where i heard noises nobody was there i felt licke i was being watched. by Manuel Tamayo Montes Jr.
The popping or crackling noise heard when "cracking your knuckles" is caused by synovial fluid filling the vacuum left by the joint's displacement.
A fuzzy crackling sound will be heard because some of the electrical waves are still being transformed into sound waves.
Β She heard some noises and looked around but saw nothing.
Have you heard about the new math teacher? When she heard the bell, she went to class. They got scared because they heard strange noises. They hit the ground when they heard gunfire.
all of the above