Radioactive substance A breaks down to substance B with a half-life of 1,000 years. If we start out with four kilograms of radioactive substance A, how much of those four kilograms of substance A will remain in 3,000 years?
A) 250 grams
B) 500 grams
C) 1 kilogram
D) 2 kilograms
B
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A layer of very warm, low density air near the surface causes light to:
A) reflect at a higher angle off of the surface. B) separate into its various color components. C) bend in a curve opposite that of the Earth. D) bend in a curve that follows the curvature of the Earth's surface.
Based on data for the period from 1970 to 2017, ________ experienced the greatest loss of life from natural disasters.
A. Asia B. North America C. South America D. Europe E. Africa
What is the Wallace Line?
a. the path expeditions on Mount Everest follow b. separates the exclusive economic zones of nations bordering the South China Seac c. the boundary between Kashmir and India d. divides Southeast Asia into two distinct biogeographic zones e. the border between Afghanistan and Pakistan
Deforestation eliminates the role that forests play in_________________.
-wildlife management -in-stream river flow -population growth -the water cycle -agricultural production