During its five-billion-year history, Earth has been hit countless times by asteroids and meteorites. Over 150 crater-producing events have been identified, and this 1994 book describes all 139 sites worldwide at which evidence of the impacts can be seen. They range in age from recent craters formed this century to the highly eroded billion-year-old ancient craters. Some are spectacular to visit, such as the Barringer Crater in Arizona, the ring-shaped mountains of Gosses Bluff, Australia, and the huge crater at Ries in Germany. For each site there is a summary table giving location, size,...

Progress with Oxford Numbers and Counting: up to 20 Age 4-5 builds number skills while helping your child to work independently. Engaging activities, fun characters and stickers keep them motivated and a progress chart captures achievements. Additional activities and support on oxfordowl.co.uk help your child to make progress whilst having fun.

Progress with Oxford: Number Problems 4-5 builds number skills while helping your child to work independently. Engaging activities, fun characters and stickers keep them motivated and a progress chart captures achievements. Additional activities and support on oxfordowl.co.uk all help your child to make progress whilst having fun.

This Progress with Oxford: Fractions, Multiplication and Division Age 5-6 workbook will help your child to progress with number skills, such as multiplication, division and fractions, while having fun. They will quickly learn to recognise and find a half and a quarter of an object and an amount and to solve problems using multiplication and division skills. The Progress with Oxford series has been created to help every child develop essential skills at home, with minimal help and support. Picture clues are used to show very young children how to complete activities, whilst reminder boxes,...

This Progress with Oxford Multiplication, Division and Fractions Age 6-7 workbook will help your child to progress with these core maths skills while having fun so they will become confident with quickly solving calculations involving multiplication and division. Each Progress with Oxford book is focused on the skills your child will need to master at each stage of the school curriculum. The books...

This Progress with Oxford Numbers Age 6-7 workbook will help your child to progress with these core maths skills while having fun so they will become confident with using numbers. Each Progress with Oxford book is focused on the skills your child will need to master at each stage of the school curriculum. The books are precisely matched to your child's age to make sure they are aligned with school...