Clark, Claire

Simple text and photographs explain a year as a unit of time and Earth's orbit of the sun.

Uses simple text and photos to explain a week as a unit of time and the days of the week.

Simple text and photos explain a month as a unit of time and the months in a year.

Uses simple text and color photographs to explain a day as a unit of time and the parts of a day. Includes a glossary and sources of more information.