By dragging the magnet across the sand, students will observe that sand often contains particles of iron.
(students; will observe; that sand; T:often contains particles of iron) Context(students will observe,List([40, 61))):(students; will observe that sand contains; particles of iron; T:often)
students will observe,List([40, 61))
students students
will observe will observe that sand contains
that sand T:often contains particles of iron
particles of iron T:often