Apysical combination of two or more substances that can seperated by physical means

A Heterogeneous mixture is a mixture of two or more chemical substances, where the different components can be visually distinguished and easily separated by physical means. Examples like mixtures of sand and water. Hope this helps :P

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.