Third Planet: Earth
The third planet in our solar system is Earth. It is the only known planet to support life, and it is the largest of the terrestrial planets.
Key Facts About Earth:
- Orbital Period: 365.25 days
- Atmosphere: Composed mainly of nitrogen and oxygen
- Surface: Covered by 71% water, with diverse landforms and ecosystems
- Moon: Has one natural satellite, the Moon
- Life: Supports a wide variety of living organisms
Study Guide:
Here are some key topics to study in relation to the third planet, Earth:
- Formation and Composition of Earth
- Earth's Atmosphere and Climate
- Geological Features: Mountains, Oceans, Continents
- Earth's Water Cycle and Bodies of Water
- Earth's Relationship with the Moon
- Biodiversity and Ecosystems on Earth
- Human Impact on the Planet
Understanding these topics will give you a comprehensive knowledge of Earth as the third planet in our solar system.
Good luck with your studies!
.◂Science Worksheets and Study Guides Eighth Grade. Our Solar System
Worksheet/Answer key
Our Solar System 
Worksheet/Answer key
Our Solar System Worksheet/Answer key
Our Solar System
Worksheet/Answer keyWorksheet/Answer keyThe resources above cover the following skills:
Earth/Space Science: Students will use scientific skills and processes to explain the chemical and physical interactions (i.e., natural forces and cycles, transfer of energy) of the environment, Earth, and the universe that occur over time.
Astronomy: Identify and describe the components of the universe.
Identify that our solar system is a component of the Milky Way Galaxy.
Astronomy: Identify and explain celestial phenomena using the regular and predictable motion of objects in the solar system.
Identify and describe how the shape and location of the orbits of asteroids and comets affect their periods of revolution.