Oceanography Chemistry?

Question

1. What is the average salinity of ocean water?
2. What causes water salinity to be higher thand usual?
3. " lower "?

Answer 1

1. About 4%
2. High evaporation or freezing (usually high evaporation) and little rain or melting or river flow in. ex: - Mediterranean Sea
3. High river flow in, rain, or melting and low evaporation.