Across
- 3. describing a climate that is very hot and humid; describing an area of Earth that is near the equator
- 5. a period of the year determined by the position of Earth as it revolves around the sun
- 7. an imaginary line that an object spins or revolves around
- 9. to guess what will happen in the future
- 10. a length of time
- 14. the measure of how hot or cold the air is outside
- 17. turning around on an axis; spinning
- 18. angular distance north and south of the equator
- 19. energy that does not need matter to travel; light
- 22. one half of a sphere
Down
- 1. a particular area of the sky; a group of stars
- 2. the circular path of an object as it revolves around another object
- 4. electromagnetic energy
- 6. a compound made of hydrogen and oxygen
- 8. any star around which planets revolve
- 9. in earth science, having to do with the areas on Earth closest to the geographic North or South poles; in chemistry, describes a molecule that has a positively charged side and a negatively charged side
- 10. a specific point in space
- 11. a large circular mass that revolves around a star
- 12. the part of the atmosphere closest to Earth; the part of the atmosphere that organisms on Earth use for respiration
- 13. to move around another object along a circular path, as in an orbit
- 15. an imaginary line that divides Earth into Northern and Southern Hemispheres; located halfway between the North and South Poles
- 16. describes something that happens every year
- 20. In the Arctic, winter temperatures average about 30 degrees below zero Fahrenheit. The Arctic is the northernmost region in the world and includes the Arctic Ocean, polar ice caps, and continental land masses such as Greenland and the northernmost parts of Canada and Russia. This region is surrounded by an imaginary line called the Arctic Circle. In the summer, the sun doesn't set in the Arctic, so there is continuous daylight all season. The opposite is true in the winter, when it is dark 24 hours a day for many months. The Arctic's climate is harsh. There are no trees and few plants, but that doesn't mean the area isn't important. Scientists studying the Arctic are concerned about the receding, or melting, polar ice caps, as well as the ways global warming can impact the region. Native American peoples who live in this region include the Inuit, the Aleut, and the Yupik. Historically, few people have lived in the Arctic region, but it is home to polar bears and a diverse number of fish, marine mammals, and birds.
- 21. the ability to do work or cause change; can be changed into different forms and can move between objects