Question

Primary succession takes much longer than secondary succession because it involves _________

Answer 1

Primary succession takes much longer than secondary succession because it involves time for weathering of rock and development of the soil horizons.

Answer 2

Rocks or lava

Step-by-step explanation:

In 1° succession there is no soil.. And the process of soil formation take very long time.

In 1° succession rocks or lava is present and lichens, soil erosion, wheathring of rocks helps in soil formation.