What were some of the ways early scholars tried to determine the age of Earth? What will be an ideal response?
One melted iron balls of various diameters to see how quickly they cooled, and then extrapolated their
cooling rate to a ball the size of Earth. His answer was 75,000 years old. Another determined the
deposition rates of sediments and then the amount of time it would take to deposit the total thickness
of sedimentary rock in Earth's crust. The answer was vast, from younger than 1 million years to older
than 1 billion years, but wasn't a good estimate because sedimentation rates vary and many
sedimentary rocks have been removed by erosion and some compacted.
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Which of the following best matches the description?Known deposits from which materials can be extracted profitably under current economic and technological conditions.
A. nonrenewable energy sources B. photovoltaic cell C. acid mine drainage D. surface mining E. geothermal energy F. overburden G. resources H. renewable energy sources I. liquefied natural gas J. active solar system K. reserves L. underground mining M. passive solar system N. secondary recovery O. black lung disease
Explain how interviewing immigrants could benefit a government or nongovernmental organization that tracks migration data
What will be an ideal response?
The internal combustion engines that run our automobiles only convert 13% of the gasoline we put in them to move the car. What happens to the other 87%?
A. It is converted into heat. B. It is converted into light. C. It is converted into high-quality energy. D. It is lost due to evaporation.
Clouds form by convection because: a. the rising air warms adiabatically, becomes saturated and condenses
b. topography forces the air upward. c. the rising air cools adiabatically, becomes saturated and condenses. d. None of these choices.