Planet Earth Crossword Puzzle

QUESTIONS LIST:

• nitrogen : earths atmosphere is made up of 78% _ and 21% oxygen
• oceans : the first life developed here
• ozone : this layer protects earth from harmful solar radiation
• water : 70% of earth is made up of _
• rocky : earth has _ surfaces
• life : earth is the only known planet to support this
• rotation : the _ of the earth is gradually slowing down
• sun : earth is the 3rd planet from the _
• terrestrial : earth is the largest planet of the _ planets
• densest : earth is the _ planet in the solar system
• deity : earth is the only planet in the solar system that is not named after a greek or roman _
• mantle : earth has 3 layers; the crust, the core, and this
• volcanic : water came to surface from this activity