Which mountain chain ranges between newfoundland, canada, and alabama, united states?

What structure on the south african coast has a range of 63 km and releases flashes every 30 seconds?

The coco river is a natural border between nicaragua and which other country

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before