How did this cone of depression in the groundwater form?
A) An artesian spring flowed upward on all sides.
B) The earth's rotation causes groundwater to twirl in a counterclockwise direction.
C) Groundwater is pumped from the well faster than it can flow to replenish what is lost.
D) Clay horizons cause perched water to flow away from a central point.
C) Groundwater is pumped from the well faster than it can flow to replenish what is lost.
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Increased numbers of aerosols in the atmosphere
A) means fewer cloud condensation nuclei. B) can only come from human activities. C) makes clouds more reflective. D) makes clouds more likely to produce precipitation. E) none of the above
Why is the Great Lakes and Corn Belt region often referred to as America's Heartland?
What will be an ideal response?
Silicon-oxygen bonds are weak and cause cleavage to be common in silicate minerals
Indicate whether the statement is true or false
Explain how radioactive decay has always warmed the earth from the inside, and nuclear fusion has always warmed the earth from the outside
A) Much heat was released as matter coalesced to form the earth. This heat resulted in the production of radioactive isotopes, which still reside within the earth today and are a source of internal heat. Our primary external source of heat is from the fusion of hydrogen within the sun. B) The inner Earth is made of fissioning heavy elements while the sun is made of lighter fusing elements. C) Radioactive elements have been within Earth since it was created while the sun is made of fusing hydrogen atoms. D) All of the above are reasonable answers.