Answer :

(a) True


These areas are the deepest parts of the oceans. The trenches are relatively steep-sided, narrow basins. They occur at the bases of continental slopes and along island arcs and are associated with active volcanoes and strong earthquakes

(b) True


Ocean relief is largely due to the tectonics, volcanic, erosional and depositional processes and their interactions. The ocean relief is divided into minor and major relief features. Major ocean relief is divided into four parts. They are Continental Shelf, Continental slope, Deep Sea plain and Trenches. Minor ocean relief features are Ridges, hills, seamounts, trenches, island arcs, submerged volcanoes and sea craps.

(c) True


Most of the salt in the ocean water is because of the rainwater discharged from the land. The rainwater is not in the purest form. It contains small portions of salts, particles and nutrients that make it salty. The surface run-off also comprises small amounts of sodium chloride or salts from the minerals thus depositing it in the sea. Since the rate of evaporation is higher in the sea, large amounts of salts are left behind which is again reinforced by the salts from the surface run-off making the sea salty.

(d) False


Ocean water does not always have a unique temperature in the overall globe. But they do not have major changes such as earth surface has, even these minor changes will show a great impact. The temperature of the ocean water varies from 2°C to 29°C. El-Nino and Al-Nino are the effects caused by the changes in the temperature of the Pacific Ocean. Even the temperature varies inside the ocean water when we go deep inside the ocean temperature falls.

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