Question

7 multiple choice 2 points what is the primary health impact of exposure to particulate matter (pm) as a primary air pollutant? cardiovascular diseases and obesity skin rashes and eye irritation gastrointestinal problems and food poisoning respiratory irritation and lung cancer 8 multiple choice 2 points what does mining and resource extraction involve? planting trees building houses removing valuable materials from the earth harvesting crops 9 multiple choice 2 points what is the primary greenhouse gas emitted when burning fossil fuels? carbon dioxide (co2) oxygen (o2) nitrogen (n2) methane (ch4)

Explanation:

• Question 7: Particulate matter (PM) is inhaled into the respiratory system. It can cause irritation in the respiratory tract. Prolonged exposure has been linked to an increased risk of lung cancer. Cardiovascular diseases can be affected by PM but it's not the "primary" impact in terms of direct exposure mechanism compared to respiratory issues. Obesity is not directly related. Skin rashes and eye irritation are more associated with other pollutants like some chemicals rather than PM as a primary effect. Gastrointestinal problems and food poisoning are related to contaminated food/water, not air - borne PM.
• Question 8: Mining and resource extraction is the process of taking valuable materials (such as minerals, ores, fossil fuels) from the Earth's crust. Planting trees is reforestation. Building houses is construction. Harvesting crops is agricultural activity.
• Question 9: When fossil fuels (like coal, oil, natural gas) burn, the carbon in them combines with oxygen. The main product is carbon dioxide ($CO_2$). Oxygen ($O_2$) is consumed in the burning process. Nitrogen ($N_2$) is a major component of air and is not a product of fossil - fuel burning in significant amounts in terms of greenhouse gas emissions from this process. Methane ($CH_4$) is a greenhouse gas but is not the primary gas emitted from burning fossil fuels (it can be emitted during extraction and transport of fossil fuels in some cases, but not from the combustion itself as the main gas).

Answer:

1. Respiratory irritation and lung cancer
2. Removing valuable materials from the Earth
3. Carbon dioxide (CO2)