Oceanic crust is less dense than continental crust
a. True
b. False
False
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Which of these hockey pucks has zero acceleration?
A. One in mechanical equilibrium. B. One at rest. C. One moving at constant velocity. D. all of the above
There are approximately ________ people on Earth.
A. 1.5 billion B. 15 million C.10 billion D.6.7 billion E.7.4 billion
Which of the following statements is not true?
A. An oxygen sag curve describes changes in a stream's dissolved oxygen content along its length below an organic-matter source. B. A body of water is described as "dead" when it contains fatal concentrations of toxic chemicals. C. Chemical treatment of sediment can be effective in reducing pollution problems, but it must be repeated every few years. D. Fast-flowing streams are generally better aerated than are lakes.
If you could travel back in time to when the Earth first formed as a planet: What kind of life would you encounter?
- All types of life in water and land, except people.
- All types of life in water and land, including people.
- Animal and plant life in water, but none on land.
- Simple, one celled organisms.
- There would be no life on Earth.