The abrupt breaking of rocks or explosions, fro example an earthquake or Nuclear bomb.
Answer:
The particles that cause the aurora are energized in the magnetosphere, that is, above the atmosphere. If they don't reach 10,000 volts, they will still cause auroral light. The lower energy won't change the wave length of the light, but will cause the light to be dimmer.
Explanation:
They need to divide so they replace old or damaged cells
The answer to this is Quaternary.
The root of the plant is what takes in water.