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Earth! Currently the only known life sustaining planet in the Milky Way!
Earth comes with it own magnetic field caused by the make up of its interior (rock, iron and nickle, and molten iron and nickle at its core), so no one will be floating away! The composition of Earth's crust (outer most layer of Earth) enables humans to grow planets that in turn help with the atmosphere.
Atmosphere
The Atmosphere is made up of 78% nitrogen, 21% oxygen, and 1% other gases all allowing humans and animals to breath with no aid. The plants on Earth continuously replenish the air cause by photosynthesis.
Plate Tectonics
Earth is also constantly changing! The changes are too hard to see now but over time you will notice changes in the placement of continents and Islands! This is due to plate tectonics! There are 12 plates total however seven of them make up 94% of Earth's crust.
Earth's Natural Phenomena
These plates are constantly moving and shifting causing earthquakes, rising mountains, the deepening of valleys, volcanic eruptions and much more; these natural phenomena help replenish the outer crust with nutrients needed to sustain life.
Yasemin Arikan
For more information and answers to your question email me at Yasarikan@gmail.com
Location: Planet Earth