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Model 1 primary succession barren rock from beneath a retreating glacier or due to a volcanic eruption low growing plants such as mosses ferns and lichens begin to colonize fast growing grasses flow ering plants and small shrubs begin to take root a thin layer of soil develops. Succession how do ecosystems develop over time answer key an owners guide to business succession planning ceo succession planning in freestanding us a boards guide to effective succession planning effective succession planning a boards guide to effective succession ecosystems and . Model 1 primary succession a b c barren rock from beneath a retreating glacier or due to a volcanic eruption low growing plants such as mosses ferns and lichens begin to colonize fast growing grasses flowering plants and small shrubs begin to take root a thin layer of soil develops. Model 1 primary succession barren rock from beneath a retreating glacier or due to a volcanic eruption low growing plants such as mosses ferns and lichens begin to colonize fast growing grasses flow ering plants and small shrubs begin to take root. Succession 1 succession how do ecosystems develop over time why on may 18 1980 mount st helens in the state of washington erupted with the force of a hydrogen bomb the volcano had been dormant for over 120 years but now 57 people were dead and forests and lakes were totally destroyed including nearby spirit lake which became a mud hole the blast leveled trees in areas over 10 miles