Mercury
a revolution, that is, the amount of time it takes the planet to complete its journey around the sun.
Mercury has the shortest orbital period. It takes only 89.9691 days to make one complete trip around the sun.
The journey a planet makes around the sun is called its orbit.
No one 'makes' the year. A year is simply the measurement of the time it takes a planet to travel one complete orbit around the star (sun) that it orbits (or one revolution). A day is the time it takes a planet to make a full spin around its axis (or one rotation).
Fairly fast. It makes a complete orbit of the planet every 24 hours and around the sun each year. Relative to the planet though, the speed is zero mph.
orbit.
They are what makes up the planet's atmosphere.
That is called the planet's orbit.
It is the rotation of the planet one complete revolution that determines the length of a day.
A revolution.
When a planet completes one full rotation on its axis, it is said to have completed one day. This results in the cycle of day and night. The time it takes for a planet to complete one full rotation varies depending on the planet.