Explanation

The troposphere is the lowest layer of the atmosphere

It is where weather occurs and contains about 75% of the atmosphere’s mass.

The principle constituent of the atmosphere of the Earth is called Nitrogen.

Explanation

Jupiter has the shortest day of any planet in our solar system

It completes one rotation in approximately 9 hours and 56 minutes.

It is also the fastest-spinning planet in the solar system.

Explanation

The coldest planet in our solar system is Uranus,

They hold the record for the lowest temperature ever measured at -371°F (-224°C)

It has 27 moons.

Its largest moon is Titania.

ADDITIONAL INFORMATION 

Neptune is also extremely cold, with an average temperature of -214°C (-353°F)

NOTE:  IF THE OPTION IS Pluto, Saturn, Mars, Jupiter ( Pluto is the correct answer)

Pluto, which is no longer classified as a planet (it is a dwarf planet), is the coldest of all the large bodies in the outer solar system,

has a temperature of about -225°C (-373°F).

NOTE: IF THE OPTION IS Uranus, Neptune, Venus, Pluto ( Uranus is the correct answer)

According to most sources, the coldest planet in the Solar System is Neptune.

Explanation

Earth's circumference is about 40,075 km (24,901 miles) at the equator

And slightly less, about 40,008 km (24,860 miles), when measured through the poles,

Because the planet bulges slightly at the equator due to its rotation. 

Its diameter (the distance from one side to the other through Earth's center) is 7,926 miles (about 12,756 kilometers).

Age: 4.453 billion years

Explanation

 A Chronometer is a device that measures an accurate time.

For example Greenwich Mean Time (GMT).