What evidence did Houdin use to create his “Spiral Ramp” theory?1.a pathway of stones circling the Great Pyramid2.an old map showing something unusual inside the Great Pyramid3.records from ancient builders describing the removal of an external ramp4.a recently discovered structural weakness in the interior of the Great Pyramid

The Great Pyramid of Giza was constructed around 2550 B.C.E., though how it was built continues to be an archaeological mystery, since the large blocks of stone that make up the building are estimated to weigh as much as 10 tons. Recently, archaeologists have uncovered a ramp at Hatnub, the site of an ancient Egyptian stone quarry. The ramp dates to the time of Pharaoh Khufu, whose rule lasted from 2575-2465 B.C.E. The researchers also discovered two staircases running alongside the ramp, which were likely lined with posts connected with rope. These discoveries have led scholars to suggest that ------- Which choice most logically completes the text?the stones used to construct the Great Pyramid were quarried close to the site to minimize transportation distance.eliminatePharaoh Khufu invented the technology that allowed for the construction of the Great Pyramid.eliminatethe massive stones used to construct the Great Pyramid were at least partially transported using a ramp-and-rope system. eliminatemodern methods for transporting massive stone blocks are less effective than ancient methods were.

The spiral model was originally proposed by

The spiral model was originally proposed byOptionsIBMBarry BoehmPressmanRoyce

The spiral model was originally proposed byOptionsRoyceBarry BoehmIBMPressman

What is the primary emphasis of the Spiral model?