Chalk is a soft white powdery limestone that's made with fossil shells of foraminifers. Chert is a hard dark opaque sedimentary rock which is made of silica with an amorphous fine grained texture.
Plant leaves and dead organic matter are broken down by decomposers,to produce soil nutrients for plants. This is an important role decomposers play in the nutrient cycles.
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Most countries were ruled by kings, queens, or priests.
Physical geography is the branch of geography dealing with the natural features and the processes
