Which was formed by erosion? the rocky mountains the pacific ocean the grand canyon the galapagos islands

ANSWER:

The Grand Canyon was formed by erosion.

EXPLANATION:

The Grand Canyon is a 'Steep-sided canyon' carved by the 'Colorado river'. The Grand Canyon is '446 km long', '29 km wide' and has a depth of over 1857 meters. The recent studies have showed that the 'Colorado river' and its tributaries ran through the 'area' about '5 to 6' million years ago. Since that time, there is constant erosion by Colorado river. In this way the 'Grand Canyon' was formed by 'erosion'.

Answer// dinosaurs emerged during mesozoic era;