What are fossils? What will be an ideal response?
Fossils are the remains or traces of once-living organisms.
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The United States generates more electricity from ________ than from any other renewable energy source.
A. hydroelectric B. solar C. geothermal D. bioenergy E. wind
Determine which soil layer best fits the following description.This layer consists mainly of organic debris and other dead plant and animal matter.
A. A horizon B. B horizon C. C horizon D. O horizon E. E horizon
The most energy-demanding activity in a typical home is
A. lighting. B. computers and electronics. C. appliances. D. heating and cooling.
What would have happened to the earth if the Sun were significantly larger than it is?
A) Liquid water and the water cycle would not exist. B) Our atmosphere would consist mainly of carbon dioxide. C) Our atmosphere would consist mainly of nitrogen. D) Our Sun would have burned out after a few hundred million years so life would not evolve.