When the Landmasses Suddenly Rise up to the Atmosphere—A Thought Experiment

I just thought about this question as I was reading the factors that affect climate. My question in mind was:

"What if suddenly, the Earth's known landmasses rise up to a height the same as the Earth's stratosphere or mesosphere? What would happen to the Earth's atmosphere? Does it adjust according to the length of the rise of the landmasses?"
"What about the planet Earth itself? Does its mass doubled and gravity is now twice as greater as it was before the sudden rise of the landmasses?"

I'm looking forward to such meaningful discussions. Best regards from all. :)

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Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$