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Why is Pluto no longer classified as a major planet in our Solar System?

Given that the geothermal gradient averages ~25°C per kilometer in the upper crust, approximately what temperature would you expect at a depth of 3 km (assuming surface temperature is 15°C)?

Which region of the Earth contains the vast majority of its volume (~84%)?

What percentage of Earth’s surface area is covered by oceans?

What is the term for a cloud of gas and dust in space from which stars and solar systems condense?

How did nucleosynthesis during the Big Bang differ from stellar nucleosynthesis?

Which gas makes up the majority of Earth’s modern atmosphere? 

What are the two most abundant elements in Earth’s entire planet by mass?

The brittle outer shell of Earth containing the crust and uppermost solid mantle is called the:

What is the average age of the Universe according to current cosmological consensus?