Fill in the blanks:Most of the deepest trenches are located close to the _____.A line joining points on the sea bed at an equal vertical distance beneath the surface is called ‘______’ or ‘Depth contour’.Over millions of years rain, rivers and streams have washed over rocks containing the compound _____________ and carried them into the sea.The total content of dissolved salts in seawater is called _________.Salinity is usually expressed as parts per _________.

Fill in the blanks:Most of the deepest trenches are located close to t

1.	Fill in the blanks:Most of the deepest trenches are located close to the _____.A line joining points on the sea bed at an equal vertical distance beneath the surface is called ‘______’ or ‘Depth contour’.Over millions of years rain, rivers and streams have washed over rocks containing the compound _____________ and carried them into the sea.The total content of dissolved salts in seawater is called _________.Salinity is usually expressed as parts per _________.
Answer» Most of the deepest trenches are located close to the continents. A line joining points on the sea bed at an equal vertical distance beneath the surface is called ‘Isobath’ or ‘Depth contour’. Over millions of years rain, rivers and streams have washed over rocks containing the compound Sodium Chloride (NaCl) and carried them into the sea. The total content of dissolved salts in seawater is called salinity. Salinity is usually expressed as parts per thousand or ppt.