Across
- 1. Days are longer than nights
- 2. Study of the structure and composition of earth
- 5. Formed from hot molten materials through hardening or solidification
- 7. Precious or semi-precious e.g. diamond
- 9. Tells the time of the day from the position of the moving shadow cast by the sun
- 10. Thin outer layer that is made up of light rocks
- 11. Formed from sediments of weathered rocks, deposited at the button of rivers or oceans, then compacted or lithified
- 14. East-west location of a place
- 17. Approximately the same length as tropical year from January to January
- 18. Color of a thin layer of the finely powdered minerals
- 20. Mixture of metallic element and waste mineral; e.g. uraninite
- 22. Generally classed as metals but are not sources of metals
- 25. Formed from already existing rocks
- 27. Equal length of day and night
- 28. Nights are longer than days
- 29. Great circle that divides the earth into two equal halves
Down
- 1. Occur because of the earth does not rotate in an upright position, compared to the plane of orbit around the sun
- 3. Extends from about 1,800 to about 3,100 miles
- 4. Ability to absorb light and give off visible rays of longer wavelength
- 6. Minerals made up of silicon e.g. olivine
- 8. During summer when daylight hours, are longer, clocks are set one hour ahead of standard time in April, ten set back again sometimes in fall
- 12. Measured by the time the earth takes to make one revolution around the sun
- 13. Natural solid materials of the earth's crust, made up of minerals
- 15. Attraction to a magnet
- 16. Ability of a mineral to reflect, refract, or absorb light falling on the surface
- 19. It had a diameter of 7936 miles
- 21. Reaches from 3,100 miles to the center of the earth
- 23. Formed in nature and with fixed chemical composition
- 24. North-south location of any place on earth
- 26. Is able to flow very slowly like a thick liquid