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Cracks in the plates are what allow built-up pressure in the magma to escape in the form of volcanoes, earthquakes, etc.

If the pressure is not periodically relieved, eventually there will be massive explosions, horrendous volcanoes forinstance, that could threaten all life. (see Deccan Traps that many scientists believe contributed significantly to one of the "Great Extinctions").

Also, volcanoes produce minerals and nutrients for deep-sea creatures and create land in the form of islands (Hawaiian Chain) and mainland mountains. If no new mountains are formed erosion would, over time, wear away all of the land.

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