four models
... that scientists have proposed four models to describe the arrangement of the layers of rock before the collision of India with Asia that formed the Himalayas?
... that scientists have proposed <b id="mwBAE"><a href="./Pre-collisional_Himalaya" id="mwBAI" rel="mw:WikiLink" title="Pre-collisional Himalaya">four models</a></b> to describe the arrangement of the layers of rock before the collision of India with Asia that formed the <a href="./Himalayas" id="mwBAM" rel="mw:WikiLink" title="Himalayas">Himalayas</a>?