Take money away from your bank account and the bank will show a negative credit. Take an electron away from an atom, however, and the atom shows up positive. Explain
A) Electrons are already negative. Therefore, we know from basic math that subtracting a negative (number) from a neutral (atom), will make the result positive.
B) Neutral atoms contain identically charged but oppositely signed protons and electrons. Removing one of the negative electrons results in an excess of positively charged protons.
C) Removing an electron from an atom does not have the atom show up positive. It simply leaves the atom short one electron.
D) Atoms are constantly exchanging electrons. Having an atom "show up positive" is only an expression indicating that it has taken its turn in the game of electron exchange.
B
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A change in the genetic composition of an individual in a population is known as
A. emigration. B. mutation. C. natural selection. D. biological evolution. E. genetic drift.
The first core regions of the world-system were the trading hubs of
A) Italy, Greece and Spain. B) Portugal, Spain and North Africa. C) Austria, Hungary & Germany. D) Holland, England & France. E) Japan, Korea and China.
Suppose the average snowfall over an area of Nunavut is 100 cm per year. How many years will it take for the snow to reach a depth of 1000 metres? (Assume there is no melting in summer and no compaction)
A. 1000 years B. 10,000 years C. 100,000 years D. 10 years
Which of the following is not true about flood basalts?
A) They cover large areas and contain huge volumes of magma. B) They cover much of the Columbia Plateau of the Pacific Northwest. C) They are fed from large interconnected composite volcanoes. D) Some flood basalts erupted at about the same time as major extinctions of species.