Does anyone know delta and star math ?

Which type of basaltic lava flow has a fairly smooth

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.