Please help easy question?

Question

which factors would most likely cause the salinity to increase

1. melting of ice and runoff or precipitation of ice

what is the correct amount of the land above sea level

material from the mantle rises up under the ocean to form

1. submarine canyons

2. continental rises

3. ocean ridges

4. sea floor trenches

Answer 1

1. Precipitation of Ice

2. Varies depends on location

3. Ocean ridges

Answer 2

1.  Precipitation of ice

??

3. Ocean ridges

Answer 3

1. Percepitation of ice.

What is the correct amount of land above sea level? 25% of Earth's land is above sea level. It is different everywhere you go. New Orleans, Louisana wouldn't count neither any of those other places wouldn't count either because they are under sea level.

2. Material from the mantle rises up under the ocean to form ocean ridges and it is related to plate tectonics.