separation "Mid-Atlantic Ridge" "Mid-Atlantic Ridge" "Mid-Atlântica" "Mid-Atlantische Rug" North American and African plates collided "Mid-Atlantic Ridge" North American and African plates collided "Mid-Atlantic Ridge" separation "Mid-Atlantic Ridge" Mid-Atlantic Ridge "Mid-Atlantic Ridge" Mid-Atlantic Ridge separation boundary between North America and Europe Mid-Atlantic Ridge The Geological Society – Mid-Atlantic Ridge The Geological Society – Mid-Atlantic Ridge The Geological Society – Mid-Atlantic Ridge North American and African plates collided Mid-Atlantic Ridge boundary between North America and Europe Mid-Atlantic Ridge Mid-Atlantic Ridge mid-Atlantic ridge "Mid-Atlantic Ridge" „Mid-Atlantic Ridge” Mid-Atlantic Ridge „Mid-Atlantic Ridge” Mid-Atlantic Ridge The Geological Society – Mid-Atlantic Ridge Mid-Atlantic Ridge Mid-Atlantic Ridge The Geological Society – Mid-Atlantic Ridge „Mid-Atlantic Ridge” The Geological Society – Mid-Atlantic Ridge The Geological Society – Mid-Atlantic Ridge The Geological Society – Mid-Atlantic Ridge Mid-Atlantic Ridge Mid-Atlantic Ridge Mid-Atlantic Ridge The Geological Society – Mid-Atlantic Ridge