Earphone definition, a sound receiver that fits in or over the ear, as of a radio or telephone. See more.
Answer Wiki. If a rocket went straight up, it would either continue in that direction and leave Earth, or it would fall back down, depending on its velocity. Most rockets intend to enter orbit, which is an elliptical trajectory, and it's much more efficient to arc into this trajectory than to go straight up and then accelerate laterally.
The reason space debris burns up in our atmosphere is because such objects fly towards Earth at great speeds. As these objects pass through the atmosphere, atmospheric gasses compress very quickly. This generates great amounts of heat, burning the objects up as they fly through.