Where two plates move ____, a constructive plate boundary occurs. As the plates move ____ from each other, a ____ appears. ____ from the ____ below rises to ____ the gap. This can result in volcanic ____ and ____. As the magma eventually ____ on the Earth's crust, new ____ rocks form. The mid-____ ridge is an example of a constructive plate boundary. The sea-____ spreads, with the newest rocks found ____ the plate boundary. ____ is an island that is on the mid-Atlantic ridge. It experiences relatively ____ volcanic eruptions.

Constructive plate boundaries

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