04e705d5_c__St__Science_SOL_s___Socrata__Subject
[Row number] 216 [Grade] 3 [SOL] 3.7c [SOL Text] The student will investigate and understand the major components of soil, its origin, and importance to plants and animals including humans. Key concepts includec) rock, clay, silt, sand, and humus are components of soils; and [Essential Knowledge] Humus is decayed matter in soil. It adds nutrients to the soil. It is located in the topsoil. Clay contains tiny particles of soil that hold water well and provides nutrients. Sand is made up of small grains of worn-down rock, has few nutrients, and does not hold water well. Silt is made up of very small broken pieces of rock. Its particles are larger than clay and smaller than sand. [Key Words] Earth Soil [Marking Period] MP3 [Subject] 
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