Об­ра­зуй­те от слова VOLCANO од­но­ко­рен­ное слово так, чтобы оно грам­ма­ти­че­ски и лек­си­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

At 2 km wide and 100 m tall, Victoria Falls is the world’s largest curtain of falling water, and is twice the width and height of Niagara Falls. Victoria Falls was formed from intense __________________ activity almost 200 million years ago.