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  1. A B C D E 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500

  2. A deep canyon in the ocean floor is called a(n) _____________________.

  3. What is a trench?

  4. Animals in the ______________ zone must be able to survive periods of being exposed to air as well as periods of being underwater.

  5. What is the intertidal zone?

  6. Why is studying the ocean floor so difficult?

  7. What is because it is deep, dark and has high pressure?

  8. Free-swimming animals that can move throughout the water column are called _______________________.

  9. What are nekton?

  10. A coastal inlet or bay in which freshwater from rivers mixes with salty ocean water is called a(n) ___________.

  11. What is an estuary?

  12. The most common plant in a salt marsh is _________________________.

  13. What is cordgrass?

  14. _______________ uses sound waves to measure the depth of the ocean floor

  15. What is sonar?

  16. Are diatoms and copepods examples of plankton, nekton, or benthos?

  17. What are plankton?

  18. Are crabs, lobsters, and sponges examples of plankton, nekton, or benthos?.

  19. What are benthos?

  20. The color of the coolest stars.

  21. What is the color red?

  22. The organisms that form the base of most open-ocean food webs are _________.

  23. What is plankton?

  24. Coastal wetlands that feature short, gnarled trees with arching prop roots are called _____________.

  25. What is the mangrove forest?

  26. Algae can only live in parts of the ocean that receive enough ____________________ to allow them to carry out photosynthesis.

  27. What is sunlight

  28. The Great Plains are the _________ biome of the United States.

  29. What is the steppe biome?

  30. A ____________ climate occurs where precipitation is less than potential evaporation.

  31. What is dry or desert?

  32. Tropical grasslands that have distinct dry and wet seasons are called ____.

  33. What are savannas?

  34. ________ climates are found along the coasts of continents in the temperate zone..

  35. What is temperate marine?

  36. A cool type of climate called _______ is found at the tops of mountains and is surrounded by other climate regions.

  37. What is highlands?

  38. Tundra and ice cap biomes are examples of _________ climates..

  39. What is a black hole?

  40. Climates are classified according to what two major factors?

  41. What are precipitation and temperature?

  42. __________ are forests that have year-round heat and heavy rainfall

  43. What are rain forests?

  44. Permafrost and mosses, lichens, and wildflowers are common in which biome?

  45. What is the tundra biome?

  46. A rain forest biome exists in the United States only in ___________.

  47. What is Hawaii?

  48. Trees do not grow in the _________, which has short, cool summers, bitterly cold winters, and permafrost.

  49. What is the tundra?

  50. Regions that receive less than 10 inches of rain annually are called _____.