8th Grade Science             Cycles                                                  Name:

Matching:

A. Stratosphere

B. Troposphere

C. Ionosphere

D. Nimbus

E. Cumulus

F. Stratus

G. Cirrus

H. Cumulonimbus

1. ___ Any cloud associated with rain.

2. ___ Very high, wispy clouds.

3. ___ Part of our atmosphere containing clouds and most of our weather.

4. ___ Uppermost atmospheric layer with particles charged by the sun.

5. ___ Thunderhead; towering thunderstorm cloud.

6. ___ Higher, layered clouds.

7. ___ Atmospheric layer with mostly horizontal flow.

8. ___ Very low, fluffy clouds.

 

9. A cycle involves a given material being:  

(a) destroyed   (b) created    (c) continually reappearing in different forms

 

10. The ozone layer is important because it:

(a) filters out ultraviolet radiation      (b) increases sunlight    (c) poisons astronauts

 

11. Which form of nitrogen is LEAST accessible to plants?

(a) Ammonia                (b) Nitrate                    (c) N2 gas

 

12. The most abundant gas in our atmosphere is: 

(a) oxygen        (b) nitrogen       (c) carbon dioxide

 

13. Water resides longest, on average, in:  (a) deep groundwater    (b) lakes   (c) glaciers

 

14. Most rain falls over:  (a) continents       (b) oceans

 

15. Which material locks up carbon so it is relatively inaccessible to life?

(a) Granite        (b) Sugar          (c) Limestone               (d) None of these

 

16. Which element results in the instability (explosiveness) of gunpowder, ammonium nitrate, dynamite, TNT, and C4?

(a) Nitrogen      (b) Oxygen       (c) Carbon       (d) Hydrogen

 

17. Nitrogen is vital for animals in the compositions of amino acids and nucleic acids.  From the amino acids they make __ and from the nucleic acids they make __.

(a) DNA; proteins                    (b) hair; muscle             (c) proteins; DNA

 

18. Photosynthesis in plants produces:  (a) O2   (b) H2O            (c) CO2

 

19. Photosynthesis splits which molecule? (a) O2           (b) H2O            (c) CO2

 

20. We have more oxygen in our atmosphere than ever before.  TRUE  or FALSE

 

21. Animals carry out respiration using:  (a) O2  (b) H2O            (c) CO2

 

22. Hydrologic refers to: (a) O2           (b) H2O            (c) CO2

 

23. About 2% of all water is in:  (a) lakes     (b) groundwater    (c) glaciers

 

24. Essay: Pick one of the 4 cycles we have studied since Christmas and explain what role YOU play in it, and how it is important to you.