1. The Solar System Module A Chapter 2 Grade 4

2. The Sun Center of the universe Has the greatest mass Largest, brightest and hottest object in the solar system

3. Key Terms Key Terms  Meteorites: chunks of rocks from outer space.  Meteors: chunks of rock that burn up brightly as they fall through the Earth’s atmospheres  Comets: icy balls of frozen gas and dust  Oort Cloud: clouds of comets

4. The Inner Planets  Mercury  Venus  Earth  Mars

5. Inner Planet Earth Orbits around The sun The Earth is an inner planet It is an inner planet Because of how close it is to the sun

6. The Inner Planets Mercury Closest planet to the sun Covered by dust Craters on it formed by meteorites

7. The Inner Planets Venus Has a thick atmosphere Surrounded by clouds Surrounded by Carbon dioxide and acid

8. The Inner Planets Mars Looks reddish You may find water here Nights are colder than the days Atmosphere is mostly carbon dioxide

9. The Outer Planets JupiterSaturnUranusNeptunePluto

10. Outer Planets Jupiter Largest planet Made of layers of liquid hydrogen and helium Rings of dust And ice Creates more heat than it receives Cold planet

11. Outer Planets Saturn Almost as large as Jupiter. Famous for its rings. Cold planet

12. The Outer Planets Uranus and Neptune Blue-green planets Very cold Very far from the sun

13. Pluto Farthest from The sun Ninth planet from The sun The smallest planet

14. Review Questions  The rings of Saturn, are caused by _______ and ______ that spin around the equator of the planet. snow and sleet? snow and sleet? Pickles and ice cream? Dust and ice?

15. Dust and Ice

16. What causes Mars to appear reddish?  Rusty Iron  Red paint  clouds

17. Rusty Iron

18. What is a meteor?  A star that burns brightly  An inner planet  Chunks of rock that falls through the Earth’s atmosphere

19. Chunks of rock that burn brightly as they fall through Earth’s atmosphere.

20. Which is the largest planet?  Earth  Jupiter  Mars

21. Jupiter

22. Chunks of rock from outer space that reach Earth’s surface are:  Neptune  Oort Cloud  Meteorites

23. Meteorites!

24. Comets called _______________ may surround the solar system. Oort Cloud Jupiter Peanut Butter Oort Cloud Jupiter Peanut Butter

25. Oort Cloud

26. Connecting Idea Inner Planets Outer Planets Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto