Is 'earth' a concrete noun or an abstract noun?

The noun 'earth' is definitely concrete. The planet Earth is one of the most tangible and visible objects that we know of in the universe because we live on it. 'Earth' can also refer to the solid surface of our planet or the ground that we walk on. The Word can also mean the soft dirt of the ground or the soil. It is worth noting that the Word can be both a common noun and a proper noun.