When air is inhaled, oxygen diffuses from the alveoli into the blood to be used for respiration by the body’s cells. Carbon dioxide is a waste product made by the body’s cells during respiration.
Divergent boundaries occur where tectonic plates are moving away from each other. Mid ocean ridges are, as the name suggests on the floor of the ocean. Some divergent boundaries can be found on land. One example is in Iceland where the Mid-Atlantic Ridge surfaces. This region represents the area where the North American Plate is moving away from the Eurasian plate. Another example can be found in Africa along the East African Rift Valley.
