Why on earth the sky is in blue colour but it is black on the moon?

Need in all of themmm only answer if you know plsssss

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island