The Earth, The Globe, Earth
noun, の adjective
The earth sphere! It's where we live and the planet we call home. It's the earth!
ちきゅう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
地球は美しい青色をしています。
The earth is beautifully blue.
コウイチは一体どこへ行ったのかな？地球の上にはいると思うんだけど...。
Where did Koichi go? I think he's somewhere on earth though...
地球の環境を守ることは重要です。
It is important to protect the environment of the earth.