Which was the first organism on earth?
How and why do landforms change over time?
Why did people used to think that the world was flat?
Why can’t we feel the earth move?
How might the discovery of life on another planet affect our actions here on Earth?
How should we address climate change?
What if all the rivers on the Earth stopped running ?
What do you think would happen if all of the earth’s electricity goes out?
What would happen if all the trees in the world disappeared?
What would happen if the sun went out?