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The ocean is also salty from rainwater that falls onto rocks or land, picks up some salt in the earth, and then trickles down into the ocean! There are also some places in the ocean floor where salty gases and minerals from within the Earth get released into the ocean!  

As water flows in rivers, it picks up small amounts of mineral salts from the rocks and soil of the river beds.

but the salt remains dissolved in the ocean - it does not evaporate. So the remaining water gets saltier and saltier as time passes.

This very-slightly salty water flows into the oceans and seas. The water in the oceans only leaves by evaporating (and the freezing of polar ice),

The rain that falls on the land contains some dissolved carbon dioxide from the surrounding air. This causes the rainwater to be slightly acidic due to carbonic acid (which forms from carbon dioxide and water).

As the rain erodes the rock, acids in the rainwater break down the rock.