Quiz-the Atmosphere, Air Pollution, And Global Climate Change

Explanation
The troposphere is the lowest layer of the Earth's atmosphere where air is heated from the ground up. This is also where weather occurs.

Explanation
Carbon dioxide is the main anthropogenic greenhouse gas produced in the United States. This means that it is the primary greenhouse gas that is released into the atmosphere as a result of human activities in the United States. While it is not the most potent greenhouse gas per molecule, it is the most abundant greenhouse gas and its levels are currently increasing in the atmosphere.

Explanation
Coal in the United States accounts for most greenhouse emissions because it is a fossil fuel that releases large amounts of carbon dioxide when burned. Coal-fired power plants are a major source of greenhouse gas emissions in the country, contributing to climate change and air pollution. The combustion of coal also releases other pollutants such as sulfur dioxide, nitrogen oxides, and particulate matter, which have harmful effects on human health and the environment. Therefore, it is true that coal is responsible for a significant portion of greenhouse emissions in the United States.

Explanation
When water warms, it expands. This is because the molecules in water gain kinetic energy and move faster, causing them to spread out and take up more space. As a result, the volume of the water increases while its mass remains the same. This expansion is the reason why water expands when it freezes, as the molecules slow down and form a crystalline structure, taking up even more space.