As a basis for understanding this concept, students know: almost all of the Earth's water is present as salt water in the oceans which cover most of the Earth's surface.
(the oceans; cover; most of the Earth's surface) (students; know; almost all of the Earth's water is present as salt water in the oceans) Context(students know,List([43, 56))):(almost all of the Earth's water; is; present as salt water in the oceans)
students know,List([43, 56))
the oceans students almost all of the Earth's water
cover know is
most of the Earth's surface
almost all of the Earth's water is present as salt water in the oceans
present as salt water in the oceans