biogeochemical cycles internet lesson

Name: ______________________________________________________ Date: ________________ Period: ________ Biogeochemical Cyc...

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Name: ______________________________________________________ Date: ________________ Period: ________

Biogeochemical Cycles Internet Lesson Answer each question by visiting the following website. http://www.geography4kids.com/files/cycles_intro.html Moving and Flowing 1. Besides food and populations, list 3 things we will examine as it moves through the ecosystem. a. ________________________

b. ________________________ c. ________________________

BIO-GEO-CHEMICAL 2. What does “bio” refer to? ___________________________________________________________________ 3. What does “geo” refer to? ___________________________________________________________________ 4. What do “chemicals” refer to? ________________________________________________________________ CLICK “CARBON” 5. Name two types of molecules needed for life that contains carbon. a. __________________________________

b. __________________________________

6. True or False (circle one): Earth has changing amounts of Carbon. Start With Plants 7. Which two molecules are required for photosynthesis? a. __________________________________

b. __________________________________

8. Which two molecules are created by photosynthesis? a. __________________________________

b. __________________________________

Then Animals Eat the Plants 9. How do animals obtain carbon? _______________________________________________________________ 10. Which process breaks down sugars and starches? ________________________________________________ 11. What happens to the carbon dioxide released by animals? _________________________________________________________________________________________ 12. Summarize the 3 steps of the carbon cycle below. Step 1

Step 2

Step 3

Who Eats the Animals? 13. List three things that decomposers break down. a. ________________________

b. ________________________ c. ________________________

14. List two gases released by decomposers. a. __________________________________

b. __________________________________

15. What are the huge underground oil fields made from? ____________________________________________ CLICK “WATER” 16. What is another word for the water cycle? ______________________________________________________ The Overview 17. Where can water in the atmosphere be found? __________________________________________________ 18. Define PRECIPITATION. _________________________________________________________________________________________ 19. List 6 types of precipitation.

20. What do rivers flow into? ____________________________________________________________________ 21. How much of the Earth is covered by water? ____________________________________________________ 22. Define EVAPORATION. _________________________________________________________________________________________ 23. How much of our cells are made from water? ___________________________________________________ Life of a Water Molecule 24. On average, how long will water stay as a cloud? _________________________________________________ 25. On average, how long will water molecules be stuck as a glacier? ____________________________________ CLICK “OXYGEN” 26. Besides the atmosphere, name 3 other locations where you can find oxygen. a. ________________________

b. ________________________ c. ________________________

Oxygen Rarely Alone 27. From what we discussed earlier in the school year, why do you think oxygen atoms are usually not found by themselves? ______________________________________________________________________________ 28. Three oxygen atoms is the molecule called _______________________________. Dissolved in Water 29. True or False (circle one): Oxygen can be found in rocks. 30. Besides breaking down rock, why are lichen important? _________________________________________________________________________________________ We Need Oxygen to Survive 31. How do the following use oxygen? a. Plants: ____________________________________________________________________________ b. Animals: ___________________________________________________________________________ 32. What happens during metabolism? ____________________________________________________________ CLICK “NITROGEN” 33. Where can most nitrogen be found on Earth? ___________________________________________________ 34. What does it mean when nitrogen is “fixed”? ____________________________________________________ Where Can You Find It? 35. True or False (circle one): Nitrogen is more plentiful than any other element. 36. Name three objects that convert nitrogen into nitrates. a. ________________________

b. ________________________ c. ________________________

Borrowing Nitrogen 37. Which organisms most use soil nitrogen? _______________________________________________________ 38. How do plants obtain nitrates? _______________________________________________________________ 39. List three types of molecules that require nitrogen. a. ________________________

b. ________________________ c. ________________________

40. Once plants obtain nitrogen, how do animals get nitrogen? ________________________________________

41. Name two ways in which nitrogen returns to the soil. a. __________________________________

b. __________________________________

CLICK “PHOSPHORUS” 42. Where is phosphorus found? _________________________________________________________________ 43. What needs to happen for phosphorus to be removed from rocks? __________________________________ Plants Need It 44. What are inorganic compounds? ______________________________________________________________ 45. How do plants get phosphorus? _______________________________________________________________ 46. How do animals get phosphorus? _____________________________________________________________ Losing the Element 47. When is phosphorus gone from the world? _____________________________________________________ 48. Where is useable phosphorus found? __________________________________________________________ Elemental Concern 49. Why is farming bad for the phosphorus cycle? _________________________________________________________________________________________ 50. What do farmers use to add phosphorus to their land? ____________________________________________ RETURN TO THE FIRST PAGE. CLICK ON THE QUIZ LOCATED NEAR THE BOTTOM OF THE PAGE TITLED “TAKE QUIZ ON BGC CYCLES” 1. What is the long version of the acronym BGC? __________________________________________ 2. Which of these is NOT a common BGC cycle? __________________________________________ 3. Plants get much of their carbon from..._________________________________________________ 4. Where do most clouds come from? ___________________________________________________ 5. Rainwater falls, collects, and never returns to the ocean. __________________________________ 6. Most of the oxygen of Earth is found as pure oxygen in the atmosphere. ______________________ 7. Plants do NOT need oxygen to survive. ________________________________________________ 8. Where do you get the nitrogen your body needs? ________________________________________ 9. Humans do NOT need to eat iron to survive. ____________________________________________ 10. Many phosphorus compounds do NOT cycle through our biosphere. _________________________