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Ocean water contains dissolved salt and solids. It contains sodium Chloride, other salts, and minerals. It also contains dissolved gases such as Nitrogen, Oxygen, and Carbon dioxide. If you are wondering how the ocean contains salt, it is because there's salt in rocks. Salt in rocks get washed in by rains and rivers. Also if you are wondering how the gases get into the ocean, it is because of the waves, and animals in the ocean. Animals add carbon dioxide, and plants add oxygen. I hope this helped. Have a great day
Transition metals have a high melting point due to the contribution of the 4s and 3d electrons to form the mobile charge cloud leading to a very strong metallic bonding which requires more energy to break thus high melting point. Due to the very close packing structure of transition metals where each atom has 12 nearest neigbours; small atomic size and hence high mass per unit volume and a high density.