Page 9 - Interpretative Reading: Explanation Text

Furthermore, the rain that falls from the sky contains small

amounts of chemicals called carbon dioxide and sulphur

dioxide which makes the rain slightly acidic. This acid can

absorb small amounts of mineral salts, including sodium and

chloride. These mineral salts are dissolved from the rocks

which then enter the water.

CONCLUSION :

Thus, the main salt in seawater is sodium chloride. The rain

water flows off the land and into the rivers and streams that

lead all the way to the sea, carrying the dissolved salts along

with it that makes the seawater salty.