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Political border between Northern Ireland and Republic of Ireland runs from Carlingford Lough to Lough Foyle, but there's another border. At Clougherhead in County Louth, evidence of a collision of continents is seen in the rock formations.
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First broadcast:
31 March 2008

Classroom Ideas

Use this clip as a starter activity for a lesson on plate tectonics. Following this, pupils could look at the past and current position of plate boundaries and explain how the plates have shifted to their current positions.

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