Question

About how long ago was the earth formed?
A. 3 billion years ago
B. 10 billion years ago
C. 4.6 billion years ago
D. 20 billion years ago

Answer 1

Hint: Our planet is the third planet from the Sun, and it is the only place we know of that is inhabited by living things so far. Although Earth is only the fifth largest planet in our solar system, it is the only one with liquid water on its surface. Earth is the largest of the four planets closest to the Sun, and it is slightly larger than nearby Venus. All four planets are made of rock and metal.

Complete answer:
The name Earth has been in use for at least 1,000 years. Except for Earth, all of the planets were named after Greek and Roman gods and goddesses. The name Earth, on the other hand, is a Germanic word that simply means "the ground." Earth is the largest of the terrestrial planets, with a radius of 3,959 miles (6,371 kilometers), and the fifth-largest planet overall.
When the solar system settled into its current configuration about 4.5 billion years ago, gravity drew swirling gas and dust to form the third planet from the Sun. Earth, like the other terrestrial planets, has a central core, a rocky mantle, and a solid crust.
The Earth rotates once every 23.9 hours as it orbits the Sun. One complete orbit around the Sun takes 365.25 days. Our calendar system, which counts one year as 365 days, is put to the test by that extra quarter of a day. To keep our yearly calendars in sync with our orbit around the Sun, we add one day every four years. That day is known as a leap day, and the year it is added to is known as the leap year.
So, about 4.6 billion years ago the earth formed.

Thus, the answer is Option C: 4.6 billion years ago.

Note:
The planet we call home, the planet Earth is a rocky, terrestrial planet. It has a solid and active surface with mountains, valleys, canyons, plains, and a variety of other features. Earth is unique in that it is an ocean planet. Water covers $70\mathrm{\%}$ of the Earth's surface. The Earth's atmosphere is mostly nitrogen, but there is plenty of oxygen for us to breathe.