science

2 Responses | Created by jtracy1970 |
  1. 1

    what are trace gases?

  2. 2

    what is earth's atmosphere made up of?

  3. 3

    what are two sources of carbon dioxide in the air?

  4. 4

    what are two processes that use oxygen?

  5. 5

    a nitrogen molecule consists of how many atoms?

  6. 6

    how much nitrogen is in the air we breathe?

  7. 7

    what does each molecule of carbon dioxide have?

  8. 8

    what marks the beginning of the mesosphere?

  9. 9

    what are the four main layers of the atmosphere?

  10. 10

    at the top of the troposphere what happens to the temperature?

  11. 11

    what are the two layers of the thermosphere?

  12. 12

    what particles do air contain?

  13. 13

    what is weather?

  14. 14

    is carbon dioxide essential for life?

  15. 15

    what is the exosphere?

  16. 16

    plants must have what to produce food?

  17. 17

    oxygen and nitrogen together make up what percent of dry air?

  18. 18

    what is the most abundant gas in the atmosphere?

  19. 19

    what is water vapor?

  20. 20

    what is an ozone?

  21. 21

    what is the atmosphere?

  22. 22

    why is the thermosphere so hot?

  23. 23

    what is the mesosphere?

  24. 24

    what is the thermosphere?

  25. 25

    what is stratosphere?

  26. 26

    what is true about oxygen?

  27. 27

    how does earth's atmosphere make conditions on earth suitable for living things?

  28. 28

    the stratosphere extends from the top of the troposphere to about 50 kilometers above the earth's surface

  29. 29

    the lower stratosphere is cold about -60 degrees c

  30. 30

    the middle portion of the stratosphere contains no ozone

  31. 31

    the uppeer stratosphere is warmer than the lower stratosphere

  32. 32

    what is the troposphere?

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