Carbon dioxide and particulates are emitted by volcanoes. Particulates form stratospheric aerosols that reflect sunlight. Which of the following best describes the impact of atmospheric carbon dioxide and stratospheric aerosols?
A. Carbon dioxide contributes to global warming, and aerosols cause cooling .

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

The chemical or mechanical process by which rock is gradually broken down eventually becoming soil

Although china’s total economic output, measured by gross domestic product (gdp), is third largest in the world, it is considered a developing nation. what is most likely the most important factor for this designation? a. china’s government spends money on things that do not benefit human development. b. china has a large population, so its gdp per person is only modest. c. china has a strong economy but weak literacy and school attendance rates. d. china’s high rates of disease offset the country's economic gains.