Which process accounts for the sky's blue color?
A) light reflection
B) light scattering
C) albedo
D) thermal convection
B
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A farmer has planted a field of clover as a cover crop to protect his field from erosion during the winter months. In the spring, he plows the clover into the topsoil. What kind of fertilizer does this technique create?
A. green manure B. animal manure C. compost D. synthetic
If the temperature in the Earth generally increases with depth, how is it possible that the inner core is a solid?
A) Temperatures increase to a certain point before leveling off below the melting point of the core. B) The pressures in the core are immense and keep it in a solid state in spite of the temperature. C) Earth's interior does not reach temperatures high enough to melt the material of the inner core. D) The inner core is shedding the heat so quickly that melting does not have time to occur.
Migrants are subject to both push and pull factors. Define push and pull factors, and give an example of each
Paleontologists and ecologists agree that ________
A) biodiversity is evenly spread over the earth's biomes B) 99% of all species that have ever existed are now extinct C) more than 99% of all species alive today have been discovered and described D) speciation is a major cause of biodiversity loss E) extinction is tied exclusively to human activities