Which of the following statements best describes the first life-forms on Earth, which existed about 3.6 billion years ago?
A. The first microbial life forms were restricted to what is now the Middle East.
B. Microbial life began at the same time the Earth turned into a solid.
C. Evidence for the first microbial life forms is found in igneous rocks.
D. Microbial life evolved rapidly into more complex life forms in only a few hundred million years.
E. Microbial life began at a time when the planet's atmosphere and climate were very different from today.
Answer: E
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When a cannon fires a cannonball, both cannon and ball undergo acceleration that is
A. greater for the cannon. B. cannot be estimated. C. greater for the cannonball. D. the same on each.
Why is the San Andreas fault in California useful to geologists?
A) It is home to the most advanced geologic command center in the United States. B) It is a convergent boundary, showing geologists firsthand what happens when plates are subducted. C) It is a transform boundary, showing geologists firsthand what happens when plates slide past one another. D) Geologists have explored caves made by earthquakes at the fault line, making many scientific breakthroughs.
Which of the following environmental examples represents systems thinking?
A) planting grass for cattle to feed on in desert regions B) studying the behavior of a global invasive species C) examining the beetle life cycle that is posing a threat to local forests D) emission control devices on California automobiles E) undertaking a long-term study of Lake Michigan ecology
Sustainable living involves ________
A) avoiding recycling but taking into consideration reusing items B) only living for today C) reducing your ecological footprint D) not considering your daily actions and the impact they have on the environment E) only learning what you need to know now