"What is the Earth?"

The Earth is a planet in the universe, one of the biggest planets, and the third planet from the sun. It has a mass of approximately 5.9 billion km² and a diameter of about 723,260 km. It is the only planet with life that we know of and the only one that can be identified with certainty. The Earth was formed . billion years ago. We are currently in the process of discovering its history and future.

"What do you mean by'most powerful organisms'?"

A powerful organism is an organism that can cause significant changes in the environment and conditions in which it lives. It needs energy to do so.

"What is a meteorite?"

A meteorite is a solid body of space debris that enters the Earth's atmosphere and falls to the Earth's surface.

"What is the Sun?"

The Sun is the star at the center of the Solar System.

"What is a nuclear reactor?"

A nuclear reactor is a device that uses the fission process to generate heat. This process is what makes a nuclear bomb.

"What does 'FLEX' mean?"

FLEX is an application that provides information about Earth science and the natural world.