The video explains that Earth is approximately 4.6 billion years old, and its formation is still debated. The Nebula theory, a widely accepted scientific explanation, suggests that Earth, the sun, and other planets formed from a nebula, a cloud of gas and dust. A nearby supernova explosion caused the nebula to collapse and spin, leading to the formation of the sun and planets, including Earth as the third planet from the sun.

How old do geologists generally believe Earth is?

• 6.0 billion years

• 5.2 billion years

• 4.6 billion years

• 3.5 billion years

What is the Nebula theory primarily about?

• The creation of black holes

• The formation of galaxies

• The origin of life on Earth

• The development of Earth and other planets from a cloud of gas and dust

What event is believed to have contributed elements to the nebula according to the Nebula theory?

• A meteor shower

• A volcanic eruption

• A supernova explosion

• A solar flare

What happened to the nebula after the supernova explosion?

• It started to spin and collapse

• It became a black hole

• It disappeared completely

• It expanded and cooled

Which planet is Earth in relation to its distance from the sun?

• First

• Fourth

• Second

• Third