35. carbon dioxide is called a greenhouse gas for which of the following reasons?
a. it absorbs and reradiates infrared radiation to warm the earth.
b. it is produced when coal and/or fossil fuels are burned.
c. it is often used inside greenhouses.
d. its oxygen component is needed by plants to grow.
36. what are the major barriers preventing us from being able to convert to renewable energy?
a. economics
b. geography
c. intermittency
d. all of the above
37. what is upwelling?
a. currents traveling the wrong direction in the pacific
b. cold dense water floating on warm water
c. melting of ice causing freshwater to float on salt water
d. rising of cold nutrient rich water from deep in the pacific
38. which type of fuel creates the most pollution?
a. nuclear
b. coal
c. wind
d. biomass
39. which characteristic is common of developing countries?
a. slower growth rate
b. longer life expectancy
c. lower fertility rate
d. higher infant mortality

Question

Accepted Answer

### Question 35
# Brief Explanations:
Carbon dioxide is a greenhouse gas because it absorbs and reradiates infrared radiation (heat) to warm the Earth. Option b is about its production (not the reason for being a greenhouse gas), option c is about its use in greenhouses (not the core greenhouse gas mechanism), option d is about plants needing it (photosynthesis, not greenhouse effect). So option a is correct.
# Answer: a. It absorbs and reradiates infrared radiation to warm the Earth.

### Question 36
# Brief Explanations:
Barriers to renewable energy conversion: Economics (costs of renewables vs non - renewables), Geography (some areas have better renewable resources but infrastructure issues), Intermittency (solar/wind not always available). So all (economics, geography, intermittency) are barriers.
# Answer: d. All of the above

### Question 37
# Brief Explanations:
Upwelling is the rising of cold, nutrient - rich water from deep in the ocean (like in the Pacific). Option a is about wrong - direction currents (El Niño - like, not upwelling), option b is about cold water floating on warm (density stratification, not upwelling), option c is about ice melting (not upwelling). So option d is correct.
# Answer: d. Rising of cold nutrient rich water from deep in the Pacific

### Question 38
# Brief Explanations:
Coal combustion releases pollutants like sulfur dioxide, nitrogen oxides, particulate matter, etc. Nuclear fuel has low pollution (if managed), wind is clean, biomass has relatively low pollution. So coal creates the most pollution.
# Answer: b. Coal

### Question 39
# Brief Explanations:
Developing countries typically have higher infant mortality (due to less access to healthcare, nutrition). They have higher growth rates (a is wrong), lower life expectancy (b is wrong), higher fertility rates (c is wrong). So option d is correct.
# Answer: d. higher infant mortality

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