EARTH in OT usually stands for one or other of the Heb. words 'eretz and 'ad
In the beginning God created the heaven and the earth.
And God said, Let the waters bring forth abundantly the moving creature that hath life, and fowl that may fly above the earth in the open firmament of heaven.
And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul.
O earth, earth, earth, hear the word of the LORD.