true or false
1. The atmosphere is the combination of gasses surrounding the earth. Apart from the presence of essential atmospheric gasses, its relative abundance is also critical.
2. The Earth system is complex and responds continuously to changes.
3. The most important feature of Earth is it's becoming a life-support device.
4. Owing to the gravitational pull they exerted on each other, the planetesimal further grew in size, creating moon-sized bodies which would later become planets.
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Answer:
true
true
true
false
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