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Complete the right form of a conditional sentence. 1. If the cooling (to be) so rapid as to prevent the formation of even small crystals after extrusion, the resulting rock may be mostly glass.
2. If the cooling of the lava happened slowly, the rocks (to be) coarse-grained.
3. The minute structures, however, disappear, often completely, if the thermal alteration (to be) very profound; thus small grains of quartz in a shale are lost or blend with the surrounding particles of clay, and the fine ground-mass of lavas is entirely reconstructed.
4. Paleo picks can also be used to determine if the sedimentary rock layers in a well (to be) higher or lower in elevation than those in a well that has already been drilled
5. If the anticlines are relatively young, they (not to erode) and appear as topographic ridges on the surface.

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