As a basis for understanding this concept: a. Students know most of Earth's water is present as salt water in the oceans, which cover most of Earth's surface.
(the oceans; cover; most of Earth's surface) (a. Students; know; most of Earth's water) Context(a. Students know,List([43, 59))):(most of Earth's water; is; present as salt water in the oceans)
a. Students know,List([43, 59))
the oceans a. Students most of Earth's water
cover know is
most of Earth's surface
most of Earth's water
present as salt water in the oceans