Development of an ecological community on a site previously devoid of life is called secondary succession.
Answer the following statement true (T) or false (F)
False
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The Great Oxygen Event marks the time, approximately 2.3 billion years ago, when ________.
a. there was a massive volcanic eruption that lead to a very rapid increase in oxygen levels on Earth b. there was significant oxygen in the atmosphere c. there was a cataclysmic weather event that absorbed most of the oxygen in the atmosphere and locked it into iron deposits in the oceans
How do scientists estimate the age of the Universe?
A. By measuring speed of light from distant stars B. By measuring the relative motion of other galaxies C. By measuring the age of the oldest known asteroids
Which method best transmits heat through water?
A. Convection B. Conduction C. Radiation D. All of these conduct heat equally well in water. E. None of these conducts heat in water.
What are examples of push factors that have driven people from rural areas to urban?
A) agricultural mechanization B) environmental disasters C) military repression D) agricultural mechanization and environmental disasters E) all of the above