Question

Which of the following is a source of dissolved substances in the ocean?

Answer 1

$\boxed{{\text{Chemical weathering of rocks}}}$ is a source of dissolved substances in the ocean.

Further Explanation:

More than 70 % of earth’s surface is occupied by water that is obtained from various seas and oceans. Water in the oceans not only contains pure water, but has several other substances present in it. These substances include different chemicals like sodium chloride, sulfates, potassium, calcium, and magnesium.

When evaporation of ocean water occurs, it removes water from it and salt is left behind so it results in an increase in the salinity of ocean water but cannot act as source of dissolved substances present in water of seas and oceans.Excretions of marine organisms result in secretion of nitrogenous substances and are efficient in water removal from the rectum. Melting of icebergs and sea ice has no effect on the sea level as they were already present inside it.

The process by which large and big rocks are broken down due to various chemical reactions of water and other substances in it is called chemical weathering of rocks. Five major types of chemical weathering include carbonation, oxidation, dehydration, hydration and hydrolysis. When rain pours down, it gets mixed with carbon dioxide of air and carbonic acid is produced, which then flows down and reacts with rocks. This leads to dissolution of some parts of rocks and hence chemical weathering of rocks acts as source of dissolved substances in water.

Hence option a is correct.

Learn more:

1. Identify the phase change in which crystal lattice is formed: brainly.com/question/1503216
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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Chemistry in everyday life

Keywords: water, ocean, sea, chemical weathering, evaporation, 70 %, carbonation, hydrolysis, hydration, dehydration, oxidation, dissolved substances.

Answer 2

The best answer among the choices given is option A. Chemical weathering of rocks is a source of dissolved substances in the ocean. It is a process that involves the erosion of rocks due to chemical reactions by water and substances dissolved in  the water. Therefore, it most likely the source of dissolved substances.