What are the main Earth systems?

Atmosphere and Hydrosphere are made of

Biosphere and Geosphere are made of

Where is carbon in the form of CO2?

What is the atmosphere made of (mostly)?

which part of the geosphere has the highest density?

Which of these layers has more iron (Fe)?

How does the soil form?

Minerals must

What is soil made of?

Why is soil important?

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