What is the second major source of elements in seawater?

Answer 1

By mass it's hydrogen.......

By mass oxygen is the most abundant element. To a first approximation, seawater is #H_2O#. Hydrogen is the most abundant atom by number, followed by oxygen. But by mass, oxygen is the most abundant element, followed of course by hydrogen.

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Answer 2

Jose Ayala

The weathering and erosion of rocks on Earth's surface releases minerals and ions into rivers, which eventually end up in the ocean, making this the second major source of elements in seawater.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.