The answer is going to be A because *Convection currents in Earth's mantle are caused by the rise of hot material rising towards the crust, becoming cooler and sinking back down.<span> This process occurs repeatedly, causing the currents to constantly flow. The movement of the currents plays a factor in the movement of the mantle.</span>
The alps are the highest and the most extensive type so f the mount ranges system of the Europe and they stretch to about 1200 km and they were formed by the 10 million of year the collision of the African and the Eurasian plates and this event led to the marine sediments to rose and they left the folded mount peaks as the mount blanc and Matterhorn.
