Albedo is a measure of how much solar radiation a surface reflects back into space. It is measured on a scale from 0 to 1. Surfaces like fresh snow have a high albedo (0.9), meaning they reflect most of the sun’s heat. Dark surfaces like the ocean or forests have low albedo (0.1), meaning they absorb most of the heat. ANSWER: (C) The Albedo
Which index is used to measure the “reflectivity” of an atmospheric surface? (A) The Lapse Rate (B) The Humidity Index (C) The Albedo (D) The Barometric Tide
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Albedo is a critical concept in climate change. It describes the “shininess” of the Earth. If the planet has a high albedo, it stays cool because it reflects sunlight. If it has a low albedo, it warms up. This creates a “feedback loop”: as global warming melts white Arctic ice (high albedo) and replaces it with dark blue ocean water (low albedo), the Earth absorbs even more heat, which melts more ice. Understanding albedo helps students see why the polar ice caps are so important for keeping the entire planet’s temperature stable.
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