Crust - is the top layer of the geosphere., Mantle - is below the crust and is divided into an upper layer and a lower layer., Outer core - is below the mantle, It is a liquid alloy made up mostly of iron and nickel., Inner core - is at the center of Earth. It is a solid ball of mostly iron and nickel, Dirt - is made of particles of rock with a mixture of other naturally occurring materials., Soil - is made up of rock particles, clay, and organic material., Individual organism - is the smallest level in the biosphere., Population - is all the individuals of the same species living in an area at the same time., Community - is a group of different populations living in an area at the same time., Ecosystem - consists of all the communities in a defined area along with all the nonliving parts of the environment.,

SCIENCE CONCEPTS 2

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