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Planet Earth

Across
The first life developed here
70% of earth is made up of _____
Earths atmosphere is made up of 78% ________ and 21% oxygen
Earth is the largest planet of the __________ planets
Earth is the ________ planet in the solar system
This layer protects earth from harmful solar radiation
Down
Water came to surface from this activity
Earth has 3 layers; the crust, the core, and this
The ________ of the earth is gradually slowing down
Earth has _______ surfaces
Earth is the only known planet to support this
Earth is the only planet in the solar system that is NOT named after a Greek or Roman ________
Earth is the 3rd planet from the _____