Succession
Primary succession is different than secondary succession. Primary succession occurs when no other growth has taken place before it. Secondary succession happens when organisms grow after there had already been growth there.
Primary
Volcano erupts and makes new volcanic rock
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Moss grows on volcanic rock and becomes pioneer species
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Short grasses start growing in thin soil that was formed from rock
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Soil gets deeper and starts forming tall grasses
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Once a large enough layer of soil has formed, trees can start growing
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