Mars has two. Earth has one. Mercury and Venus are the only planets without moons. The outer Solar System includes Jupiter, Saturn, Uranus, Neptune and Pluto and the rest of the moons.
Answer:
the u.s. navigation signal timing and rang, and (navstar) GPS
Answer:
Around 3,000-4,000 meters
Explanation:
The continental slope extends from the shelf break to water depths typically of around 3,000–4,000 m where an abrupt change in gradient delimits the foot of slope.
Layer B would 'be'(get it??) would be the oldest of the two because it came before layer D. The second part to the question I don't understand.