The roots spread deep into the earth.
Meaning: This sentence describes how the roots of the tree are growing very deep into the ground.
Choice of Words: Roots are the underground parts of a plant that anchor it in the soil and absorb water and nutrients. Spread means to extend or distribute over a wide area. Deep refers to a great distance below the surface. When you put them together, "The roots spread deep into the earth" conveys the idea of the tree's extensive root system.
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