What if all the rivers on the Earth stopped running ?
Why is air a poor conductor of heat?
What would happen if all the trees in the world disappeared?
What accomodations do societies make during periods of drought?
Why do we need water to survive?
What would happen if the sun went out?
How can we measure the amount of plastic in the ocean using an optical device?
Where does the salt go when salt water turns into water vapor?
Why are redwood trees so big if they live in the same conditons as regular trees?
What would the earth be like if all the trees died?