Across
- 2. the process of burning something
- 3. process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions will sink
- 6. the scientific study of the universe; it includes the observation and interpretation of celestial bodies and phenomena
- 9. the center of mass of two or more bodies orbiting around each other
- 12. process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high energy carbohydrates such as sugars and starches
- 14. a large cloud of dust and gas in space
- 15. the direct transfer of heat from one substance to another substance that it is touching
- 18. the transfer of energy by electromagnetic waves
- 21. the complete range of electromagnetic waves placed in order of increasing frequency
- 23. the process in which smaller nuclei merge together into a single larger nucleus, this process powers the sun
- 24. shortwave radiation emitted by the sun; most UV rays are blocked by the ozone layer in the upper atmosphere
Down
- 1. planets made primarily out of gas,also known as "gas giants", includes Jupiter, Saturn, uranus and, neptune
- 4. a stream of electrically charged particles produced by the suns corona deflected by earths magnetic field
- 5. incoming solar radiation
- 6. the point in a planets orbit in which it is furthest from the sun. also when the planet travels slowest
- 7. the point in a planet orbits in which it is closest to the sun. also when the planet travels fastest
- 8. the two times of the year on which neither hemisphere is tilted toward or away from the sun; day and night are equal lengths in both hemispheres
- 10. the motion of a body, such as a planet or moon, along a path around some point in space. it takes 365.25 days for the earth to complete a full revolution around the sun
- 11. the turning, or spinning, of a body on its axis. takes 24 hours for the earth to complete a full rotation
- 13. a slow motion of Earth's axis that traces out a cone cover a period of 26,000 years
- 16. either of the two times in the year; the summer solstice and the winter solstice, in which the N or S hemispheres experience their longest or shortest days due to the orientation of the tilt
- 17. the process by which a large nucleus is split into smaller nuclei, this process powers nuclear power plants and bombs
- 19. a tide just after a first or third quarter moon, when there is the least difference between high and low water
- 20. a tide just after a new or full moon, when there is the greatest difference between high and low water
- 22. the wobbling of earths axis, changing the Earth's tilt by 0.5 degrees every 18 years