Автор: Myrl Shireman
Название: Mass and Weight (Readers Advance; Science Readers , Grade 4)
Издательство: Mark Twain Media
Год: 2012
Формат: PDF
Размер: 12.6 Mb
Язык: Английский

Have you ever wondered why astronauts float in space or why they weigh less on the moon? Written for students in grade 4, Mass and Weight explains mass and weight and how they relate to gravity.