Explain the meaning of the expression “like dissolves like.”

"Like dissolves like" is an expression used by chemists to remember how some solvents work. It refers to "polar" and "non-polar" solvents and solutes. Basic example: Water is polar. Oil is non polar.  Like dissolves like, that means polar dissolves polar, so water dissolves salt.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.