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While physical weathering breaks down a rock's physical structure, chemical weathering alters a rock's chemical composition. Physical weathering works with mechanical forces, such as friction and impact, while chemical weathering takes place at the molecular level with the exchange of ions and cations.
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Importance of Greenhouse Gases
Greenhouse gases, such as carbon dioxide, methane, nitrous oxide, and certain synthetic chemicals, trap some of the Earth's outgoing energy, thus retaining heat in the atmosphere. This heat trapping causes changes in the radiative balance of the Earth—the balance between energy received from the sun and emitted from Earth—that alter climate and weather patterns at global and regional scales.
Multiple lines of evidence confirm that human activities are the primary cause of the global warming of the past 50 years.1 Natural factors, such as variations in the sun's output, volcanic activity, the Earth's orbit, the carbon cycle, and others, also affect Earth's radiative balance. However, beginning in the late 1700s, the net global effect of human activities has been a continual increase in greenhouse gas concentrations.
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Cumulative is formed by the addition of new material of the same kind. Comprehensive is covering completely or broadly.
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I believe the correct answer is B: <u>the Inca roads crossed mountains, while the Silk Road traveled through lowlands.</u>
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<em>Since the Inca roads were in the mountains and I the silk road was on low lands. It would make sense for it to be</em> B. But I could be mistaken.
