Earth (Day) Questions - first half

In honor of Earth Day later this week, here are several questions about the Earth. What is our place in the solar system; what are our relationships with our sun and our moon, and how do they effect life on Earth; what is the relationship between physical (abiotic, non-living) realities like the tilt of the Earth and our seasons, and how do the seasons, in turn, affect the biota.

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