Final answer:
The heating up of the Earth's atmosphere is explained by the theory of global warming, which is caused by human activities releasing greenhouse gases.
Step-by-step explanation:
The heating up of the Earth's atmosphere is a phenomenon that can be explained by the theory of global warming. Global warming is the long-term increase in the average temperature of the Earth's atmosphere due to the increased concentration of greenhouse gases, such as carbon dioxide.
These greenhouse gases trap heat radiated from the Earth's surface and prevent it from escaping back into space, leading to a gradual rise in temperature. The primary cause of global warming is human activities, specifically the burning of fossil fuels for energy production, deforestation, and industrial processes.
These activities release large amounts of greenhouse gases into the atmosphere, enhancing the natural greenhouse effect and causing the Earth's atmosphere to heat up. The consequences of this warming include climate change, rising sea levels, and more frequent extreme weather events.