http://oceanservice.noaa.gov/facts/whysalty.html 3.5 percent 35 grams of salts http://oceanservice.noaa.gov/facts/whysalty.html National Oceanic and Atmospheric Administration 35 parts per thousand erosion from rainfall https://oceanservice.noaa.gov/facts/whysalty.html 35 grams of salts National Oceanic and Atmospheric Administration concentrations of salt in surface seawater salt Ocean salt primarily comes from rocks on land National Oceanic and Atmospheric Administration salt dissolved NOAA NOAA una altura de 150 metros Why is the ocean salty? NOAA.gov 3.5 percent to National Oceanic and Atmospheric Administration dense saltwater http://oceanservice.noaa.gov/facts/whysalty.html http://oceanservice.noaa.gov/facts/whysalty.html dissolved https://oceanservice.noaa.gov/facts/whysalty.html National Oceanic & Atmospheric Administration NOAA 35 grams of salts ocean http://oceanservice.noaa.gov/facts/whysalty.html 3.5% salt 35 grams of salts National Ocean Service National Ocean Service seawater