Water itself - H2O.
The most abundant mineral in the ocean floor is basalt. There are also some other minerals like sand, gravel and granite that are found in the ocean floor.
Mind is the second most abundant substance in the human body
CARBON
The most abundant substance in the cytoplasm of cells is water, by a good margin. The most abundant organelle [cellular organ] by mass are ribosomes, which convert DNA into protein.
ammonia
This substance is water, H2O.
hydrogen
China..... I only know 1 so sorry China is the most abundant with magnesium :)
Water (H2O)
water. water.
The most abundant chemical substance in the human body is water. There are a lot of H2O molecules throughout the human body.
The solvent is the most plentiful substance