Beyond the answers - interesting background to this quiz

The Red Sea is still widening

The Red Sea lies in a rift between the African and Asian continental plates. It is part of a geologically active system that also includes the Gulf of Aden and the East African Rift. Over millions of years, the sea has been slowly widening as the plates move apart. This makes it one of the youngest ocean basins on Earth, and a valuable place for studying how oceans form.

The Titans ruled before the Olympians

In Greek mythology, Zeus was the youngest child of Cronus and Rhea, both Titans. The Titans were the generation of deities who ruled before Zeus and his siblings overthrew them. That conflict, known as the Titanomachy, ended with the Olympians taking control of the cosmos. Many of the defeated Titans were then imprisoned in Tartarus.

Port Vila looks over a natural harbour

Port Vila is the capital and largest city of Vanuatu, an island nation in the South Pacific. It sits on the island of Efate, around a large natural harbour that has long been central to local trade and transport. The city is also the country's main economic hub, combining government offices, markets and a busy port.

Nitrogen makes up most of the air

The chemical symbol N stands for nitrogen, not neon or niobium. Nitrogen is a colourless, odourless gas that makes up about 78 percent of Earth's atmosphere. It is essential for life because it forms part of amino acids and nucleic acids, although most living things cannot use it directly from the air. That is why nitrogen-fixing bacteria and industrial processes are so important.

The web changed how we used the internet

Email existed before the 1990s, but the World Wide Web became widely available during that decade. The web added hyperlinked pages and browsers to the existing internet, making information far easier to access for non-specialists. Its rapid spread transformed communication, commerce and publishing, and laid the foundation for the online services people use today.