1. 200 300 400 500 100 200 300 400 500 100 200 300 400 500 100 200 300 400 500 100 200 300 400 500 100 A BCDE

2. The distance light travels in a year.

3. What is a light year?

4. The color of the coolest stars

5. What is red?

6. Stars are born when this starts

7. What is nuclear fusion?

8. The lifetime of a star depends on its ________

9. What is the star’s mass?

10. A supernova is the explosion of a dying _________ mass star.

11. What is a high mass star?

12. The Milky Way galaxy is an example of a(n) ___________________ galaxy.

13. What is a spiral galaxy?

14. The absolute brightness of a star depends on its ______.

15. What is size and temperature?

16. The Hertzsprung-Russell diagram shows that main- sequence stars _______ in brightness as they _____ in temperature.

17. What is increase and increase?

18. The force that tends to pull together the matter in stars is ________________________.

19. What is gravity?

20. Benthos are organisms that live where?

21. What is on the ocean floor?

22. List three examples of nekton.

23. Name anything that swims freely.

24. The part of the ocean that extends from the low-tide line to the edge of the continental shelf is the ______ zone.

25. What is the neritic zone?

26. Kelp forests grow in the _________ zone

27. What is the neritic zone?

28. Organisms in tide pools must survive changes in _______ caused by rainfall and evaporation.

29. What is salinity?

30. In what zone are hydrothermal vents located?

31. What is the deep zone?

32. In the open ocean, algae live only in______ zone

33. What is the surface zone?

34. Organisms in the deep ocean that produce their own light are called __________..

35. What is bioluminescent?

36. A nearly flat region of the ocean floor, covered with thick layers of sediment, is called a(n) _____________.

37. What is an abyssal plain?

38. The area that stretches from the highest high-tide line on land out to the point on the continental shelf exposed by the lowest low tide is called the ___________.

39. What is the intertidal zone?

40. A ring-shaped reef surrounding a shallow lagoon is known as a(n) ________.

41. What is an atoll?

42. An area where ocean water rises through cracks in the ocean floor, having been heated by the magma beneath the ocean floor, is called a(n) ______________.

43. What are hydrothermal vents?

44. Coral reefs are found in warm waters in the ___________ zone

45. What is the neritic zone?

46. Beyond the edge of the continental shelf lies the _______zone, which includes the deepest and darkest areas of the ocean.

47. What is the open-ocean zone?

48. Beyond the edge of the continental shelf lies the ____________________ zone, which includes the deepest and darkest areas of the ocean..

49. What is the open-ocean zone?

50. Which ocean floor feature is made up of a range of mountains that wind through the ocean?.

51. What is the mid-ocean ridge?