What is the shape of the Earth?

Which planet do we live on?

What is the largest ocean on Earth?

Which gas do humans need to breathe?

What do we call the layer of air that surrounds the Earth?

Which is the largest continent on Earth?

How many continents are there on Earth?

What is the center part of the Earth called?

What percentage of Earth’s surface is covered with water?

What is the natural satellite of Earth?