Higher atmospheric temperatures cause glaciers to melt more quickly. The melting of glaciers exposes new bedrock and ocean surface. Bedrock and ocean absorb more energy from the sun than ice, and this increases the overall temperature. The increased temperature then leads to additional melting. Which concept best represents the situation described above?

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"

the statements that apply here about binary star system are

"have stars that might appear to wobble"

"often have one star that is brighter than other"

a binary star is a star system consisting of two stars revolving around their common barycenter. systems of two or more stars are called multiple star systems.