Prior to differentiation, Earth was a molten homogenous mass. What three sources of heating were responsible for
Earth’s molten state? Which source contributes to Earth’s internal temperature today? What will be an ideal response?
Answers should include:1.
Meteorite impacts
2. Gravitational compression
3. heat from radioactive decay
Radioactive decay continues to contribute to Earth’s internal temperature.
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Melting permafrost might accelerate climate change because
A. carbon dioxide is trapped as water melts. B. polar bears and other arctic species rely on permafrost. C. sea levels will rise. D. methane gas stored in the frozen ground will be released. E. coral reefs rely on methane.
Which two countries are NOT members of the European Union?
A) Finland and Sweden B) Germany and Denmark C) Norway and Switzerland D) Portugal and Austria E) Spain and France
In 1968, the U.S. Congress passed the ____ to establish protection of rivers with outstanding wildlife, geological, scenic, recreational, historical, or cultural values.
A. National Rivers and Wetlands Act B. National Rivers of Interest Act C. National Wild and Scenic Rivers Act D. Federal Freshwater Act E. Federal Scenic Waterways Act
A sandstone with more than 25% sand-sized feldspar is an arkose.
Answer the following statement true (T) or false (F)