What is the most common substance on earth is water?

Answer 1

That depends in part on what you mean by "substance", and whether you measure by volume, by mass, or by number of moles! The most common elements (water is not an element) in the Earth's crust (atmosphere, oceans, land, up to a depth of a few kilometers), by mass, are oxygen, silicon, and aluminium - in that order.

Answer 2

Water is the most common substance on Earth, covering about 71% of the planet's surface. It is essential for all forms of life and plays a crucial role in various Earth processes such as weather patterns, erosion, and nutrient cycling.

Answer 3

Iron

Oxygen is the most abundant element on Earth. It comprises 49.5 percent of the total mass (amount) of the Earth's crust, waters, and atmosphere.

Answer 4

Plankton