What was the colour of litmus paper in the sodium hydroxide solution?​

It turns a greenish color.

Explanation:

When it's dipped into a vial of sodium hydroxide, or NaOH, which is basic, it turns a greenish color. When pH paper is in the presence of pure water, it turns purple. Note that litmus paper only turns two colors: red for acids and blue for bases.

1. glaciers are melting

2. more water going into ocean (water's such as fresh waters, etc)