The principal characteristic that determines whether an aquatic ecosystem is classified as marine or freshwater is

Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.

Hurry where is the majority of earth's water found? o glaciers o oceans ground o rivers and lakes

In "the man in the water," what was the remarkable occurrence that rosenblatt reported?