What is a Year?
In science, a year is the time it takes for a planet to complete one orbit around its star. On Earth, a year is approximately 365.25 days long. This is the time it takes for the Earth to complete one full orbit around the Sun.
Study Guide:
- Definition: Define a year as the time it takes for a planet to complete one orbit around its star.
- Earth's Year: Explain that on Earth, a year is approximately 365.25 days long due to its orbit around the Sun.
- Seasons: Describe how the Earth's orbit and tilt cause the changing of seasons.
- Leap Year: Discuss the concept of a leap year and why it is necessary to account for the extra 0.25 days in Earth's orbit.
- Other Planets: Explore how the length of a year varies on other planets in our solar system.
◂Science Worksheets and Study Guides Third Grade. How animals grow and change and live
Study Guide
How animals grow and change and live 
Worksheet/Answer key
How animals grow and change and live Worksheet/Answer key
How animals grow and change and live Worksheet/Answer key
How animals grow and change and live Worksheet/Answer key
Cycling Vocabulary/Answer key
How animals grow and change and live Vocabulary/Answer key
How animals grow and change and live
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
LIFE SCIENCE (NGSS)
From Molecules to Organisms: Structures and Processes
Students who demonstrate understanding can:
Develop models to describe that organisms have unique and diverse life cycles but all have in common birth, growth, reproduction, and death.
Biological Evolution: Unity and Diversity
Students who demonstrate understanding can:
Use evidence to construct an explanation for how the variations in characteristics among individuals of the same species may provide advantages in surviving, finding mates, and reproducing.