List the reasons for variations in salinity in the various oceans.

The following factors are the reasons for salinity variation in the ocean,

1. Most common factor which affects or varies the salinity is the rock erosion or rock weathering in the ocean. It pours the salt as well as the minerals into the oceanic water.

2. Other factor is the rate of evaporation which differs as per the oceanic surroundings.

3. Then, ice formation in the sea that increases the salinity in the ocean.

4. Other cumulative factors decreases ocean's salinity. It includes the drainage of river or fresh water in the ocean, with the altered rate of precipitation and meltdown of ice.

it would be 2 or b because the clouds are a form of condensation

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.