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Assessment
What gas is most abundant in the Earth's atmosphere?
Nitrogen
Oxygen
Carbon Dioxide
Argon
What phenomenon is primarily responsible for the seasons on Earth?
The tilt of the Earth's axis
The distance of the Earth from the Sun
Ocean currents
The rotation of the Earth
What type of cloud is characterized by a flat base and often indicates fair weather?
Cumulus
Stratus
Cirrus
Nimbostratus
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