Describe the position of earth moon and sun during a solar eclipse

Solar eclipses result from the Moon blocking the Sun relative to the Earth; thus Earth, Moon and Sun all lie on a line. Lunar eclipses work the same way in a different order: Moon, Earth and Sun all on a line. In this case the Earth's shadow hides the Moon from view.

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true