use the information in the reading and in the diagram you just made to answer the following questions:
1. ______ what is the greenhouse effect?
a. the warming of a planet due to trapped gasses in the atmosphere.
b. the cooling of earth due to air pollution.
c. the heating of a solid, such as a rock.
2. ______ which of the following are greenhouse gases?
a. carbon dioxide b. methane c. water vapor d. all of these
3. ______ without the \greenhouse effect\ which would be true?
a. the earth would catch on fire
b. the earth would cool to a point we could not live here
c. the earth would heat up drastically
4. ______ what do greenhouse gases do?
a. act as a thermal blanket for the earth, absorbing heat and warming the surface
b. reflect earths incoming solar energy
c. block the suns infrared radiation
5. ______ which of the following could happen to light rays from the sun as they hit earths surface?
a. they are absorbed by the land, air and ocean
b. they are reflected back to space
c. they are trapped by greenhouse gases in the earths atmosphere.
d. all of these
observe the amount of co₂ in the atmosphere from 400,000 years ago on the graph.
6. ______ what can you say has happened to the co₂ levels over that amount of time?
a. they have steadily increased.
b. they have steadily decreased.
c. they have increased & decreased over time.
7. ______ notice the current level of co₂. how does it compare the levels of co₂ in the past?
a. it is about the same as the rest of the graph
b. it is much higher now than ever before.
c. it is a little higher than in the past.
8. there are the same amount of carbon atoms on earth now as there were in the past, but there are more in the atmosphere ever before. what explanation do you have for this?

Question

use the information in the reading and in the diagram you just made to answer the following questions:
1. ______ what is the greenhouse effect?
   a. the warming of a planet due to trapped gasses in the atmosphere.
   b. the cooling of earth due to air pollution.
   c. the heating of a solid, such as a rock.
2. ______ which of the following are greenhouse gases?
   a. carbon dioxide    b. methane  c. water vapor  d. all of these
3. ______ without the \greenhouse effect\ which would be true?
   a. the earth would catch on fire
   b. the earth would cool to a point we could not live here
   c. the earth would heat up drastically
4. ______ what do greenhouse gases do?
   a. act as a thermal blanket for the earth, absorbing heat and warming the surface
   b. reflect earths incoming solar energy
   c. block the suns infrared radiation
5. ______ which of the following could happen to light rays from the sun as they hit earths surface?
   a. they are absorbed by the land, air and ocean
   b. they are reflected back to space
   c. they are trapped by greenhouse gases in the earths atmosphere.
   d. all of these
observe the amount of co₂ in the atmosphere from 400,000 years ago on the graph.
6. ______ what can you say has happened to the co₂ levels over that amount of time?
   a. they have steadily increased.
   b. they have steadily decreased.
   c. they have increased & decreased over time.
7. ______ notice the current level of co₂. how does it compare the levels of co₂ in the past?
   a. it is about the same as the rest of the graph
   b. it is much higher now than ever before.
   c. it is a little higher than in the past.
8. there are the same amount of carbon atoms on earth now as there were in the past, but there are more in the atmosphere ever before. what explanation do you have for this?

Accepted Answer

### Question 1
# Brief Explanations:
The greenhouse effect is the warming of a planet because greenhouse gases in the atmosphere trap heat. Option a matches this definition. Option b is incorrect as it's about cooling (opposite of greenhouse effect), and option c is about heating a solid, not a planetary warming process.
# Answer:
a. The warming of a planet due to trapped gasses in the atmosphere.

### Question 2
# Brief Explanations:
Carbon Dioxide, Methane, and Water Vapor are all known greenhouse gases. So "All of these" (option d) is correct as the other options (a, b, c) are individual greenhouse gases and d includes all of them.
# Answer:
d. All of these

### Question 3
# Brief Explanations:
The greenhouse effect keeps Earth warm enough to support life. Without it, Earth would lose the trapped heat and cool down to a temperature where life as we know it couldn't exist. Option a (catching fire) is incorrect, and option c (heating drastically) is also incorrect as the greenhouse effect is about retaining heat, not causing drastic heating.
# Answer:
b. The Earth would cool to a point we could not live here

### Question 4
# Brief Explanations:
Greenhouse gases act like a thermal blanket: they absorb infrared radiation (heat) emitted by Earth's surface and re - emit some of it back, warming the surface. Option b is incorrect as they don't reflect incoming solar energy (most solar energy passes through), and option c is incorrect as they don't block infrared radiation but absorb and re - emit it.
# Answer:
a. act as a thermal blanket for the Earth, absorbing heat and warming the surface

### Question 5
# Brief Explanations:
Sunlight hitting Earth's surface can be absorbed by land, air, and ocean (option a), reflected back to space (option b), and the heat (infrared) from the warmed surface can be trapped by greenhouse gases (option c). So all of these (option d) can happen.
# Answer:
d. All of these

### Question 6
# Brief Explanations:
Looking at the graph of CO₂ over 400,000 years, the levels have gone up and down (fluctuated) over time, not steadily increased or decreased. So option c is correct.
# Answer:
c. They have increased & decreased over time.

### Question 7
# Brief Explanations:
From the graph, the current level of CO₂ is much higher than the historical levels (including the highest historical level shown). Option a (same as rest) is wrong, and option c (a little higher) is also wrong as the increase is significant.
# Answer:
b. It is much higher now than ever before.

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