Conditions on Earth are becoming more and more extreme and kids want to learn about it Is it true that tornadoes have the strongest winds on Earth? Yes Their winds can reach 300 miles per hour (483 kph), sweeping up anything in their paths. They can toss cars and trees through the air and even level entire towns. INSIDE, YOU LL FIND: - How tornadoes form, how they spin, and an account of the most dangerous tornadoes...