'Ground' in the Bible

Are not two sparrows sold for a farthing? and one of them shall not fall on the ground without your Father.

But other fell into good ground, and brought forth fruit, some an hundredfold, some sixtyfold, some thirtyfold.

But he that received seed into the good ground is he that heareth the word, and understandeth it; which also beareth fruit, and bringeth forth, some an hundredfold, some sixty, some thirty.

And he commanded the multitude to sit down on the ground.