Given a scientific passage and an answer, generate a question for the given answer.
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Question: Passage: and . The electric force is 39 orders of magnitudes bigger. Answer: 39

Answer: How many orders of magnitudes bigger is the electric force?

Question: Passage: Carbon behaves as a metal because it conducts heat and electricity well. It is a nonmetal because it is black and brittle and cannot be made into sheets or wires. Answer: heat and electricity

Answer: Carbon behaves as a metal because it conducts which two things well?

Question: Passage: Weather stations contain many instruments for measuring weather conditions. The weather balloon ( Figure above ) will rise into the atmosphere until it bursts. As it rises, it will gather weather data and send it to the surface. Many weather satellites orbit Earth. They constantly collect and transmit weather data from high above the surface. A radar device sends out radio waves in all directions. The waves bounce off water in the atmosphere and then return to the sender. The radar data shows where precipitation is falling. It's raining in the orange-shaded area shown above. Answer: when it bursts

Answer:
When do weather balloons return to earth?