Beyond the answers - interesting background to this quiz

A river that crosses borders before it reaches the sea

The Indus is one of the great rivers of Asia, rising in the Tibetan plateau and flowing through China, India and Pakistan before emptying into the Arabian Sea near Karachi. Its name gave India its name, and its waters support one of the most densely irrigated regions on Earth. The river is also central to the Indus Waters Treaty, a 1960 agreement between India and Pakistan that has survived decades of political tension.

Antarctica's ice giant

Lambert Glacier, in East Antarctica, is the largest glacier in the world by volume and one of the fastest-moving. It drains a huge portion of the East Antarctic Ice Sheet into the Amery Ice Shelf. Because so much of the world's fresh water is locked up in Antarctic ice, changes in glaciers like Lambert are watched closely by scientists studying sea level rise.

Titicaca, the lake in the sky

Lake Titicaca sits on the border of Peru and Bolivia at roughly 3,800 metres above sea level, making it one of the highest large lakes in the world. It was the heartland of the Inca civilisation, and its waters remain culturally important to the Aymara and Quechua communities who live around it. The lake is also home to unusual wildlife, including the giant Titicaca frog.

Zeus and the generation before Olympus

In Greek mythology, Zeus was the son of the Titans Cronus and Rhea. The Titans were the older generation of gods who ruled before the Olympians, and Zeus led the revolt that overthrew them. This family drama - parents devouring children, siblings plotting together - shaped much of Greek myth and later influenced Roman, and eventually European, storytelling.