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The approximate percent of oxygen in the atmosphere is

The approximate percent of oxygen in the atmosphere is. less than 1 percent 78 percent 21 percent 99 percent. The gas removed from the atmosphere by plants during the food-making process is. Oxygen carbon dioxide nitrogen ozone.

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The approximate percent of oxygen in the atmosphere is

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  1. The approximate percent of oxygen in the atmosphere is • less than 1 percent • 78 percent • 21 percent • 99 percent

  2. The gas removed from the atmosphere by plants during the food-making process is • Oxygen • carbon dioxide • nitrogen • ozone

  3. Strong eastward winds that blow around the Earth in the lower stratosphere are called • the jet stream • solar winds • convection currents • radiation belts

  4. The highest layer of the atmosphere is the • Thermosphere • Stratosphere • Troposphere • mesosphere

  5. ozone is made up of atoms of • nitrogen • oxygen • hydrogen • carbon

  6. In comparing the troposphere to the stratosphere, the troposphere • is at the same level as the stratosphere • touches the Earth while the stratosphere does not. • has a constant temperature of -60oC while the temperature of the stratosphere changes constantly. D. contains jet stream winds which are absent in the stratosphere.

  7. Living things use nitrogen for • breathing • drinking • making proteins • making carbohydrates.

  8. We live in the • Mesosphere • Troposphere • Stratosphere • Ionosphere

  9. Most of the ultraviolet rays from the sun never reach your skin because 1. convection currents in the stratosphere absorb them. 2. they mix with water vapor in the mesosphere 3. ozone absorbs them 4. the jet stream suspends them in the troposphere

  10. In our atmosphere, the mesosphere • has the warmest temperature of all atmospheric zones. • separates the stratosphere from the troposphere. • protects us from meteoroids. • may reach temperatures as high as 2000oC.

  11. Oxygen is used by living things to • make food. • break down water. • make water. • break down food.

  12. The correct order of atmospheric layers from the Earth to outer space is • stratosphere, troposphere, mesosphere, thermosphere. • troposphere, mesosphere, stratosphere, thermosphere. • mesosphere, troposphere, thermosphere, stratosphere. • troposphere, stratosphere, mesosphere, thermosphere.

  13. Most all of our weather occurs in what layer of the atmosphere? • Stratosphere • mesosphere • troposphere • thermosphere

  14. In the demonstration “Egg in a bottle”, what pushed the boiled egg into the glass flask? • convection currents • air pressure • solar wind • jet stream

  15. In the demonstration with the candle, what could you see when the projector was turned on? • convection currents • air pressure • solar wind • jet stream

  16. In the activity “The Magic Glass” (where you held an index card under the rim of a cup), what kept the index card in place? • convection currents • air pressure • solar wind • jet stream

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