Cultures of the past have generally been unaffected by climate changes
What will be an ideal response?
This is not the case. Jared Diamond has persuasively argued in his recent book
Collapse that human ignorance and climate have both played roles in the destruction of
civilizations. The near extinction of Iceland settlements during the hard times of the Little
Ice Age is an example. Extension 17.4 provides more examples.
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Which statement best describes a theory?
a. A group of ideas about how something should be done, made, or thought about b. A specific statement about nature that needs further testing c. An idea considered so obviously true that the idea does not need to be questioned d. A fundamental principle in which scientists have great confidence e. A general description of some aspect of nature that has been thoroughly tested and widely accepted
Plants get their energy directly from the Sun and their carbon from the atmosphere. Given this, they can be classified metabolically as
A) photoheterotrophs B) chemoheterotrophs C) chemoautotrophs D) photoautotrophs
How tightly the nucleons in a nucleus are bound together is indicated by the nucleus's
a. atomic number. b. mass number. c. neutron number. d. half-life. e. binding energy.
The position of a mass that is oscillating on a spring is given by x = (12.3 cm) cos[(1.26s-1)t]. What is the acceleration of the mass when t = 0.825 s?
A) 9.89 cm/s2 B) -9.89 cm/s2 C) 10.6 cm/s2 D) -10.6 cm/s2 E) 0 cm/s2