Explain why temperature changes occur.
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The temperature of the Earth depends on the balance between energy entering and leaving the system of the planet. When the incoming energy from the sun is absorbed by the Earth system, Earth warms up. When the energy of the sun is reflected back into space, Earth avoids warming. When absorbed energy is released back into space, Earth cools down.

Explanation:

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.