Final answer:
Africa is indeed the only continent through which the Tropic of Cancer, the Equator, and the Tropic of Capricorn all pass, making the continent's climate and geography extremely diverse.
Step-by-step explanation:
The statement that Africa is the only continent where all three tropical lines cross is True. The tropical lines referred to are the Tropic of Cancer, the Equator, and the Tropic of Capricorn. Africa's vast expanse extends from the northern temperate zone, through the equatorial region, and into the southern temperate zone. This geographical diversity allows Africa to encompass a range of climates including deserts like the Sahara, tropical rainforests such as the Congo, and different climatic regions including savannas and temperate zones.