1. currently, americans rely heavily on the burning of fossil fuels as sources of energy. as a result of increased demand for energy sources, there is a continuing effort to find alternatives to burning fossil fuels.
discuss fossil fuels and alternative energy sources. in your answer be sure to:
a. state one disadvantage of burning fossil fuels for energy
b. identify one energy source that is an alternative to using fossil fuels
c. state one advantage of using this alternative energy source

2. millions of acres of tropical rain forest are being destroyed each year. which change would most likely occur over time if the burning and clearing of these forests were stopped?
a) an increase in the amount of atmospheric pollution produced
b) a decrease in the source of new medicines
c) an increase in the amount of oxygen released into the atmosphere
d) a decrease in the number of species

3. carbon dioxide makes up less than 1 percent of earths atmosphere, and oxygen makes up about 20 percent. these percentages are maintained most directly by
a) respiration and photosynthesis
b) the ozone shield
c) synthesis and digestion
d) energy recycling in ecosystems

Question

1. currently, americans rely heavily on the burning of fossil fuels as sources of energy. as a result of increased demand for energy sources, there is a continuing effort to find alternatives to burning fossil fuels.
discuss fossil fuels and alternative energy sources. in your answer be sure to:
a. state one disadvantage of burning fossil fuels for energy
b. identify one energy source that is an alternative to using fossil fuels
c. state one advantage of using this alternative energy source

2. millions of acres of tropical rain forest are being destroyed each year. which change would most likely occur over time if the burning and clearing of these forests were stopped?
a) an increase in the amount of atmospheric pollution produced
b) a decrease in the source of new medicines
c) an increase in the amount of oxygen released into the atmosphere
d) a decrease in the number of species

3. carbon dioxide makes up less than 1 percent of earths atmosphere, and oxygen makes up about 20 percent. these percentages are maintained most directly by
a) respiration and photosynthesis
b) the ozone shield
c) synthesis and digestion
d) energy recycling in ecosystems

Accepted Answer

# Brief Explanations:
## Question 1a:
Burning fossil fuels releases greenhouse - gases like CO2, causing climate change.
## Question 1b:
Solar energy is an alternative to fossil fuels. It is abundant and widely available.
## Question 1c:
Solar energy is renewable and clean, producing no harmful emissions during operation.
## Question 2:
Tropical rain - forests produce oxygen through photosynthesis. Stopping their destruction would increase oxygen release.
## Question 3:
Respiration consumes oxygen and releases carbon dioxide, while photosynthesis does the opposite, maintaining the gas percentages in the atmosphere.

# Answer:
## 1a:
Burning fossil fuels contributes to climate change due to greenhouse gas emissions.
## 1b:
Solar energy
## 1c:
It is a renewable and clean energy source.
## 2:
C. an increase in the amount of oxygen released into the atmosphere
## 3:
A. respiration and photosynthesis

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