Chris Oxlade

Text and photographs introduce readers to mountains, including information about explorers and volcanoes.

Profiles different explorers throughout history and their discoveries around the world, from expeditions in ancient times to new advances in modern exploration. Includes fact boxes, an index, and a glossary.

Discusses the phenomenon of unidentified flying objects, including notable sightings throughout history and possible explanations for them.

Uses cutaway schematic diagrams and comprehensive explanations to introduce young readers to the elementary principles of how steam locomotives work and can be repaired.

Explores the phenomenon of black holes, explains why astronomers think they exist, what causes them, what they are like inside, and the search to find black holes in space.