Earth systems puzzle

4. an eruption of gas from the sun's surface that occurs when the loops in sunspot regions suddenly connect.
5. earth's only natural satellite.
7. term describing a model of the solar system in which Earth and the other planets revolve around the sun.
9. seventh planet from the sun.
11. the spinning motion of a planet on its axis.
12. morning star.
13. an imaginary line that passes through a planet's center and its north and south poles, about which the planet rotates.
14. an object that orbits a star, is large enough to have become rounded by its own gravity, and has cleared area of its orbit.
17. the central region of the sun, where nuclear fusion takes place.
20. the blue planet.
22. the largest planet in the solar system.
24. the middle layer of the sun's atmosphere.
25. this is the largest moon of.
26. the red planet.
27. our galaxy.
28. the outer layer of the sun's atmosphere.
29. distance traveled by light in a vacuum in one tropical year.

1. a region of very tightly packed gas in the sun's interior where energy is transferred mainly in the form of electromagnetic radiation.
2. the trapping of heat near a planet's surface by certain gases in the planet's atmosphere.
3. term describing a model of the universe in which Earth is at the center of the revolving planets and stars.
4. a stream of electrically charged particles that emanate from the sun's corona.
6. the inner layer of the sun's atmosphere that gives off its visible light; the sun's surface.
8. the path of an object as it revolves around another object in space.
10. a dark area of gas on the sun's surface that is cooler than surrounding gases.
15. shape of the planet orbits.
16. smaller bodies in orbit around the sun.
18. the name often given to the four inner planets: Mercury, Venus, Earth, and Mars.
19. the star at the center of the solar system.
20. the process in which two atomic nuclei combine to form a larger nucleus, forming a heavier element and releasing huge amounts of energy; the process by which energy is produced in stars.
21. smallest planet in the solar system.
23. the outermost layer of the sun's interior.