Across
- 1. absolute __________ is the actual measure of how much light a star produces
- 3. these collections of gas and dust are where new stars form
- 4. the spinning of an object around its axis
- 6. the milky way is a _________ galaxy
- 8. this star system contains two stars at the center
- 11. a lump of ice and rock that creates a tail when it gets close to the sun
- 13. the shape of the moon takes as it revolves around the earth
- 15. an object that orbits the sun, is spherical and has cleared its orbit of other debris
- 17. these resources are virtually infinite
- 19. the color of the hottest stars in our universe
- 22. a gap in the geologic record due to erosion
- 26. the law of ___________ states that rocks found in higher up layers are younger than rocks found in lower layers
- 29. this planet is the hottest in the solar system
- 30. a natural ________ is something that occurs naturally and that humans use
- 32. the type of tide that occurs when the suns gravity counteracts the moons, bringing a less extreme high and low tide
- 35. the color of the coldest stars in our univerese
- 37. a group of stars, star systems, star cluster, gas and dust held together by gravity
- 41. this unit is the average distance between the sun and the earth
- 43. the number of deaths per 1000 individuals for a certain period of time
- 44. this planet rotates on its side
- 46. a giant ball of superheated gas, or plasma, made mostly of hydrogen and helium
- 47. this type of pollution comes from a specific, identifiable location
- 48. this instrument takes in electromagnetic radiation and focuses it
- 50. all of space and everything in it
- 52. the type of eclipse that occurs when the earth casts a shadow on the moon
- 53. the type of eclipse that occurs when the moon casts a shadow on the Earth
- 54. the name of the program that was responsible for landing a man on the moon
- 55. a large structure that creates electricity from falling water
- 57. __________ decay is the breakdown of an element, turning it into a new element
- 60. the advance of desert like conditions into what was a fertile area
- 62. the number of light years to the nearest star, proxima centauri
- 63. the attraction of all objects towards ever other object
- 64. the ________ age of a rock is its measured age of the rock since it formed
- 65. the idea that the earth is the center of the solar system
- 66. this is the practice of using resources in a way that will maintain them at a certain quality
Down
- 2. the sun, planets and their moons, and a variety of other objects
- 5. these resources are finite and will run out eventually or do not replace themselves fast enough
- 7. a pattern of stars that people imagine represent a figure, animal or object
- 9. the preserved remains of living things
- 10. this pattern of growth shows that the larger a population gets, the faster it grows
- 12. a toxic form of oxygen, but can also block harmful ultraviolet radiation
- 14. the closest planet to the sun
- 16. the scientist who created the law of universal gravitation
- 18. the removal of forests to use the land for other reasons
- 20. the distance light travels in one year
- 21. nuclear ________ is the splitting of an atom into two new atoms. this creates immense amounts of clean energy
- 22. the darkest part of a shadow
- 23. fossil ____ are energy rich substances made from the preserved remains of living things
- 24. the north star. appears to stay stationary as the earth rotates under it
- 25. the number of times the moon both rotates and revolves in a lunar cycle
- 27. the idea that the sun is the center of the solar system
- 28. these dark patches on the sun are cause by the suns intense magnetic field
- 31. the explosion of a high-mass star
- 33. the oval shape of an orbiting body
- 34. light this form of energy is detectable by our eyes
- 36. thermal _________ is the increase in volume of a substance as its temperature increases. this is leading to a rise in sea level
- 38. this planet is best known for its rings
- 39. long units of time that divide the geologic time scale
- 40. the movement of an object around another object
- 42. the earth has seasons because its axis is ____
- 45. the earth and sun are similar in that they both have _______
- 49. the halfway point between the solstices, when the length of day and night are the same
- 51. the ________ age of a rock is it's age in relation to the ages of other rocks found near it
- 56. eras are divided into smaller units called _______
- 58. this solid fossil fuel is dug our of the ground and burned to create heat and ultimately electricity
- 59. this type of pollution comes from an unidentifiable location
- 61. electromagnetic _________ is energy that move through space in the form of waves