<P> The Mid-Atlantic Ridge ( MAR ) is a mid-ocean ridge , a divergent tectonic plate or constructive plate boundary located along the floor of the Atlantic Ocean , and part of the longest mountain range in the world . In the North Atlantic it separates the Eurasian and North American Plates , and in the South Atlantic it separates the African and South American Plates . The ridge extends from a junction with the Gakkel Ridge ( Mid-Arctic Ridge ) northeast of Greenland southward to the Bouvet Triple Junction in the South Atlantic . Although the Mid-Atlantic Ridge is mostly an underwater feature , portions of it have enough elevation to extend above sea level . The section of the ridge that includes Iceland is known as the Reykjanes Ridge . The ridge has an average spreading rate of about 2.5 centimetres ( 0.98 in ) per year . </P>
<P> The Mid-Atlantic Ridge ( MAR ) is a mid-ocean ridge , a divergent tectonic plate or constructive plate boundary located along the floor of the Atlantic Ocean , and part of the longest mountain range in the world . In the North Atlantic it separates the Eurasian and North American Plates , and in the South Atlantic it separates the African and South American Plates . The ridge extends from a junction with the Gakkel Ridge ( Mid-Arctic Ridge ) northeast of Greenland southward to the Bouvet Triple Junction in the South Atlantic . Although the Mid-Atlantic Ridge is mostly an underwater feature , portions of it have enough elevation to extend above sea level . The section of the ridge that includes Iceland is known as the Reykjanes Ridge . The ridge has an average spreading rate of about 2.5 centimetres ( 0.98 in ) per year . </P>
iceland sits atop what type of plate boundary
iceland sits atop what type of plate boundary
The Mid-Atlantic Ridge
The Mid-Atlantic Ridge