Bimmah Sinkhole in Arabic, and hence the name. To preserve the sinkhole, the local municipality developed a park, Hawiyat Najm Park (Haweat Najm Park), around it, along with a stairway leading down to the lake. The original cavern formed in the limestone of the Abat formation which lies below the more massive Seeb formation. When the cavern grew too large the rocks of the Seeb collapsed into it forming a sinkhole. It formed so close to the sea because of the increased subterranean water flow that occurred down-gradient. Bimmah Sinkhole Bimmah Sinkhole (Arabic هـويـة نـجـم "Hawaiyat Najm") is a water-filled depression, structurally
Collapse of the World Trade Center both cases, the section of the building that had been damaged by the airplanes failed, which allowed the floors above the impact zone to fall onto the undamaged structure below. As the collapse progressed, dust and debris could be seen shooting out of the windows several floors below the advancing destruction, caused by the sudden rush of air from the upper levels. The first fragments of the outer walls of the collapsed North Tower struck the ground 11 seconds after the collapse started, and parts of the South Tower after 9 seconds. The lower portions of both buildings' cores (60