Final answer:
Partial tides occur when the gravitational pull of the Sun and the Moon partially cancels each other out, leading to lower than usual tides. Component waves found in the sea are the individual waves that make up the overall pattern of tides.
Step-by-step explanation:
Partial tides occur when the gravitational pull of the Sun and the Moon partially cancel each other out, leading to lower than usual tides. These occur when the Moon is at first quarter or last quarter phase, and the tides produced by the Sun partly counteract the tides of the Moon. In contrast, component waves found in the sea are the individual waves that make up the overall pattern of tides. These component waves are caused by the gravitational forces of the Moon and the Sun acting on different parts of the ocean.